Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!-- go/cmark -->
+<!--* freshness: {owner: 'mbonadei' reviewed: '2021-06-25'} *-->
+
+# WebRTC supported plaftorms and compilers
+
+## Operating systems and CPUs
+
+The list of officially supported operating systems and CPUs is:
+
+*   Android: armeabi-v7a, arm64-v8a, x86, x86_64.
+*   iOS: arm64, x86_64.
+*   Linux: armeabi-v7a, arm64-v8a, x86, x86_64.
+*   macOS: x86_64, arm64 (M1).
+*   Windows: x86_64.
+
+Other platforms are not officially supported (which means there is no CI
+coverage for them) but patches to keep WebRTC working with them are welcomed by
+the WebRTC Team.
+
+## Compilers
+
+WebRTC officially supports clang on all the supported platforms. The clang
+version officially supported is the one used by Chromium (hence the version is
+really close to Tip of Tree and can be checked
+[here](https://source.chromium.org/chromium/chromium/src/+/main:tools/clang/scripts/update.py)
+by looking at the value of `CLANG_REVISION`).
+
+See also
+[here](https://source.chromium.org/chromium/chromium/src/+/main:docs/clang.md)
+for some clang related documentation from Chromium.
+
+Other compilers are not officially supported (which means there is no CI
+coverage for them) but patches to keep WebRTC working with them are welcomed by
+the WebRTC Team.