Send compositor frame IPC with metadata.

cc/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 "cc/switches.h"
 
 namespace cc {
 namespace switches {
 
 // On platforms where checkerboards are used, prefer background colors instead
 // of checkerboards.
 const char kBackgroundColorInsteadOfCheckerboard[] =
     "background-color-instead-of-checkerboard";
 
 const char kDisableThreadedAnimation[]      = "disable-threaded-animation";
 
+// Send a message for every frame from the impl thread to the parent compositor.
+const char kEnableCompositorFrameMessage[] = "enable-compositor-frame-message";

[piman, 2012/12/14 22:02:22]

Do we need this flag in the long run? It feels like we're passing a flag to make
a decision at run-time for something that will (eventually?) be compiled just
one way or the other, hence won't work if the flag is not properly set (or
unset).
If we need it for the transition, that's ok, but I hope we're going to eliminate
it soon.

[aelias_OOO_until_Jul13, 2012/12/15 00:06:17]

We don't need it in the long run, it's only for the transition.

+
 // Paint content on the compositor thread instead of the main thread.
 const char kEnableImplSidePainting[] = "enable-impl-side-painting";
 
 const char kEnablePartialSwap[]             = "enable-partial-swap";
 
 const char kEnablePerTilePainting[]         = "enable-per-tile-painting";
 
 // Number of worker threads used to rasterize content.
 const char kNumRasterThreads[] = "num-raster-threads";
 
@@ skipping 19 matching lines @@
 // Show rects in the HUD wherever something is not known to be drawn opaque and
 // is not considered to be occluding the pixels behind it.
 const char kShowNonOccludingRects[] = "show-nonoccluding-rects";
 
 // Show metrics about overdraw in about:tracing recordings, such as the number
 // of pixels culled, and the number of pixels drawn, for each frame.
 const char kTraceOverdraw[] = "trace-overdraw";
 
 }  // namespace switches
 }  // namespace cc