Adding third_party/openh264 build files for encoding

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1226 matching lines @@
     'video_hole%': '<(video_hole)',
     'v8_use_external_startup_data%': '<(v8_use_external_startup_data)',
     'cfi_vptr%': '<(cfi_vptr)',
     'cfi_diag%': '<(cfi_diag)',
     'cfi_blacklist%': '<(cfi_blacklist)',
     'mac_views_browser%': '<(mac_views_browser)',
     'android_app_version_name%': '<(android_app_version_name)',
     'android_app_version_code%': '<(android_app_version_code)',
     'enable_webvr%': '<(enable_webvr)',
 
+    # Enable this to build OpenH264.
+    # CHECK THE OPENH264 LICENSE BEFORE BUILDING. The default value should be 0,
+    # the open source version of Chromium should not build this by default due
+    # to license and patent reasons.
+    'use_openh264%': 1,

[phoglund_chromium, 2015/11/16 14:51:41]

Only, it's 1. Is this temporary just to run on the trybots? If so, please write
so.

[phoglund_chromium, 2015/11/16 14:52:21]

Oh, right, you wrote that in the CL desc. Never mind.

+
     # Turns on compiler optimizations in V8 in Debug build.
     'v8_optimized_debug%': 1,
 
     # Use system protobuf instead of bundled one.
     'use_system_protobuf%': 0,
 
     # Use system yasm instead of bundled one.
     'use_system_yasm%': 0,
 
     # Use system ICU instead of bundled one.
@@ skipping 5087 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }