cc: Add command line for frame production throttle

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 80e356e0c3a80fa5e71602242a7c0df12a1a4d66..5aa97c765435667e6ed80dfad5097348c78dcdfd 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -10,6 +10,8 @@
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
+#include "cc/base/switches.h"
+#include "ui/gl/gl_switches.h"
 
 namespace cc {
 
@@ -81,6 +83,8 @@ LayerTreeSettings::LayerTreeSettings()
 LayerTreeSettings::~LayerTreeSettings() {}
 
 SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
+  base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
+
   SchedulerSettings scheduler_settings;
   scheduler_settings.use_external_begin_frame_source =
       use_external_begin_frame_source;
@@ -93,8 +97,12 @@ SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
       maximum_number_of_failed_draws_before_draw_is_forced_;
   scheduler_settings.using_synchronous_renderer_compositor =
       using_synchronous_renderer_compositor;
+
   scheduler_settings.throttle_frame_production =
-      !renderer_settings.disable_gpu_vsync;
+      (cmd->HasSwitch(::switches::kDisableGpuVsync)

[brianderson, 2015/06/24 01:16:45]

We try to avoid checking the command line flags directly in cc code. Can you
move this to the same place we check for disable-display-vsync and assign it to
a new member variable of LayerTreeSettings?

[Jimmy Jo, 2015/06/24 09:38:31]

Done.

+           ? false
+           : !cmd->HasSwitch(switches::kDisableCompositorVsync));
+
   scheduler_settings.main_thread_should_always_be_low_latency = false;
   scheduler_settings.background_frame_interval =
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);