Disable HW H264 decoder for Win7 & add enable flag

content/public/common/content_switches.cc

 // 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.
 
 #include "build/build_config.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
@@ skipping 992 matching lines @@
 
 // Enables the Win32K process mitigation policy for certain PPAPI mime
 // types. Each mime type is separated by a comma. Specify * to enable
 // the policy for all mime types.
 const char kEnableWin32kLockDownMimeTypes[] =
     "enable-win32k-lockdown-mimetypes";
 
 // Enables experimental hardware acceleration for VP8/VP9 video decoding.
 const char kEnableAcceleratedVpxDecode[] = "enable-accelerated-vpx-decode";
 
+// Enables H264 HW decode acceleration for WebRtc on Win 7.
+const char kEnableWin7WebRtcHWH264Decoding[] =
+    "enable-win7-webrtc-hw-h264-decoding";
+
 // DirectWrite FontCache is shared by browser to renderers using shared memory.
 // This switch allows us to pass the shared memory handle to the renderer.
 const char kFontCacheSharedHandle[] = "font-cache-shared-handle";
 
 // Sets the free memory thresholds below which the system is considered to be
 // under moderate and critical memory pressure. Used in the browser process,
 // and ignored if invalid. Specified as a pair of comma separated integers.
 // See base/win/memory_pressure_monitor.cc for defaults.
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches