cc: Add command line for frame production throttle

ui/compositor/compositor.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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 75 matching lines @@
   cc::LayerTreeSettings settings;
 
   // When impl-side painting is enabled, this will ensure PictureLayers always
   // can have LCD text, to match the previous behaviour with ContentLayers,
   // where LCD-not-allowed notifications were ignored.
   settings.layers_always_allowed_lcd_text = true;
   settings.renderer_settings.refresh_rate =
       context_factory_->DoesCreateTestContexts() ? kTestRefreshRate
                                                  : kDefaultRefreshRate;
   settings.main_frame_before_activation_enabled = false;
-  settings.renderer_settings.disable_gpu_vsync =
-      command_line->HasSwitch(switches::kDisableGpuVsync);
+  if (command_line->HasSwitch(switches::kDisableGpuVsync)) {
+    std::string displayVsyncStr =

[danakj, 2015/07/14 19:43:42]

display_vsync_string

[Jimmy Jo, 2015/07/15 00:47:27]

Done.

+        command_line->GetSwitchValueASCII(switches::kDisableGpuVsync);
+    settings.renderer_settings.disable_display_vsync =

[brianderson, 2015/07/14 01:48:25]

Might be easier to read this way:

if (displayVsyncStr == "gpu") {
  settings.renderer_settings.disable_display_vsync = true;
} else if (displayVsyncStr == "beginframe") {
  settings.wait_for_beginframe_interval = false;
} else {
  settings.renderer_settings.disable_display_vsync = true;
  settings.wait_for_beginframe_interval = false;
}

[Jimmy Jo, 2015/07/15 00:47:27]

Done.

+        (displayVsyncStr == "gpu" || displayVsyncStr.empty());
+    settings.wait_for_beginframe_interval =
+        !(displayVsyncStr == "beginframe" || displayVsyncStr.empty());
+  }
   settings.renderer_settings.partial_swap_enabled =
       !command_line->HasSwitch(cc::switches::kUIDisablePartialSwap);
 #if defined(OS_WIN)
   settings.renderer_settings.finish_rendering_on_resize = true;
 #endif
 
   // These flags should be mirrored by renderer versions in content/renderer/.
   settings.initial_debug_state.show_debug_borders =
       command_line->HasSwitch(cc::switches::kUIShowCompositedLayerBorders);
   settings.initial_debug_state.show_fps_counter =
@@ skipping 340 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui