CrOS: Set max frames pending for UI from command line.

content/browser/renderer_host/image_transport_factory.cc

Index: content/browser/renderer_host/image_transport_factory.cc
diff --git a/content/browser/renderer_host/image_transport_factory.cc b/content/browser/renderer_host/image_transport_factory.cc
index e37ea28433836bb2acf8f625fbb23bb29a6d30d5..46073ac1948cdd8a01fc903ac960ca31890ab04d 100644
--- a/content/browser/renderer_host/image_transport_factory.cc
+++ b/content/browser/renderer_host/image_transport_factory.cc
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/threading/non_thread_safe.h"
 #include "cc/output_surface.h"
 #include "cc/output_surface_client.h"
@@ -33,6 +34,7 @@
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_setup.h"
+#include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/test_web_graphics_context_3d.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
@@ -305,6 +307,16 @@ class BrowserCompositorOutputSurface
         output_surface_proxy_(output_surface_proxy),
         compositor_message_loop_(compositor_message_loop),
         compositor_(compositor) {
+    CommandLine* command_line = CommandLine::ForCurrentProcess();
+    if (command_line->HasSwitch(switches::kUIMaxFramesPending)) {
+      std::string string_value = command_line->GetSwitchValueASCII(
+        switches::kUIMaxFramesPending);
+      int int_value;
+      if (base::StringToInt(string_value, &int_value))
+        capabilities_.max_frames_pending = int_value;
+      else
+        LOG(ERROR) << "Trouble parsing --" <<  switches::kUIMaxFramesPending;
+    }
     DetachFromThread();
   }