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diff --git a/toolkit/crashreporter/google-breakpad/src/common/linux/memory_mapped_file_unittest.cc b/toolkit/crashreporter/google-breakpad/src/common/linux/memory_mapped_file_unittest.cc
new file mode 100644
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+++ b/toolkit/crashreporter/google-breakpad/src/common/linux/memory_mapped_file_unittest.cc
@@ -0,0 +1,208 @@
+// Copyright (c) 2011, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// memory_mapped_file_unittest.cc:
+// Unit tests for google_breakpad::MemoryMappedFile.
+
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "breakpad_googletest_includes.h"
+#include "common/linux/memory_mapped_file.h"
+#include "common/tests/auto_tempdir.h"
+#include "common/tests/file_utils.h"
+#include "common/using_std_string.h"
+
+using google_breakpad::AutoTempDir;
+using google_breakpad::MemoryMappedFile;
+using google_breakpad::WriteFile;
+
+namespace {
+
+class MemoryMappedFileTest : public testing::Test {
+ protected:
+  void ExpectNoMappedData(const MemoryMappedFile& mapped_file) {
+    EXPECT_TRUE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() == NULL);
+    EXPECT_EQ(0U, mapped_file.size());
+  }
+};
+
+}  // namespace
+
+TEST_F(MemoryMappedFileTest, DefaultConstructor) {
+  MemoryMappedFile mapped_file;
+  ExpectNoMappedData(mapped_file);
+}
+
+TEST_F(MemoryMappedFileTest, UnmapWithoutMap) {
+  MemoryMappedFile mapped_file;
+  mapped_file.Unmap();
+}
+
+TEST_F(MemoryMappedFileTest, MapNonexistentFile) {
+  {
+    MemoryMappedFile mapped_file("nonexistent-file", 0);
+    ExpectNoMappedData(mapped_file);
+  }
+  {
+    MemoryMappedFile mapped_file;
+    EXPECT_FALSE(mapped_file.Map("nonexistent-file", 0));
+    ExpectNoMappedData(mapped_file);
+  }
+}
+
+TEST_F(MemoryMappedFileTest, MapEmptyFile) {
+  AutoTempDir temp_dir;
+  string test_file = temp_dir.path() + "/empty_file";
+  ASSERT_TRUE(WriteFile(test_file.c_str(), NULL, 0));
+
+  {
+    MemoryMappedFile mapped_file(test_file.c_str(), 0);
+    ExpectNoMappedData(mapped_file);
+  }
+  {
+    MemoryMappedFile mapped_file;
+    EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
+    ExpectNoMappedData(mapped_file);
+  }
+}
+
+TEST_F(MemoryMappedFileTest, MapNonEmptyFile) {
+  char data[256];
+  size_t data_size = sizeof(data);
+  for (size_t i = 0; i < data_size; ++i) {
+    data[i] = i;
+  }
+
+  AutoTempDir temp_dir;
+  string test_file = temp_dir.path() + "/test_file";
+  ASSERT_TRUE(WriteFile(test_file.c_str(), data, data_size));
+
+  {
+    MemoryMappedFile mapped_file(test_file.c_str(), 0);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
+  }
+  {
+    MemoryMappedFile mapped_file;
+    EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
+  }
+}
+
+TEST_F(MemoryMappedFileTest, RemapAfterMap) {
+  char data1[256];
+  size_t data1_size = sizeof(data1);
+  for (size_t i = 0; i < data1_size; ++i) {
+    data1[i] = i;
+  }
+
+  char data2[50];
+  size_t data2_size = sizeof(data2);
+  for (size_t i = 0; i < data2_size; ++i) {
+    data2[i] = 255 - i;
+  }
+
+  AutoTempDir temp_dir;
+  string test_file1 = temp_dir.path() + "/test_file1";
+  string test_file2 = temp_dir.path() + "/test_file2";
+  ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
+  ASSERT_TRUE(WriteFile(test_file2.c_str(), data2, data2_size));
+
+  {
+    MemoryMappedFile mapped_file(test_file1.c_str(), 0);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data1_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
+
+    mapped_file.Map(test_file2.c_str(), 0);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data2_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
+  }
+  {
+    MemoryMappedFile mapped_file;
+    EXPECT_TRUE(mapped_file.Map(test_file1.c_str(), 0));
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data1_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
+
+    mapped_file.Map(test_file2.c_str(), 0);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data2_size, mapped_file.size());
+    EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
+  }
+}
+
+TEST_F(MemoryMappedFileTest, MapWithOffset) {
+  // Put more data in the test file this time. Offsets can only be
+  // done on page boundaries, so we need a two page file to test this.
+  const int page_size = 4096;
+  char data1[2 * page_size];
+  size_t data1_size = sizeof(data1);
+  for (size_t i = 0; i < data1_size; ++i) {
+    data1[i] = i & 0x7f;
+  }
+
+  AutoTempDir temp_dir;
+  string test_file1 = temp_dir.path() + "/test_file1";
+  ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
+  {
+    MemoryMappedFile mapped_file(test_file1.c_str(), page_size);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data1_size - page_size, mapped_file.size());
+    EXPECT_EQ(
+        0,
+        memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
+  }
+  {
+    MemoryMappedFile mapped_file;
+    mapped_file.Map(test_file1.c_str(), page_size);
+    EXPECT_FALSE(mapped_file.content().IsEmpty());
+    EXPECT_TRUE(mapped_file.data() != NULL);
+    EXPECT_EQ(data1_size - page_size, mapped_file.size());
+    EXPECT_EQ(
+        0,
+        memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
+  }
+}