Support dynamic switching between integrated and discrete GPUs on Mac OS X.

content/renderer/pepper_platform_context_3d_impl.cc

Index: content/renderer/pepper_platform_context_3d_impl.cc
===================================================================
--- content/renderer/pepper_platform_context_3d_impl.cc	(revision 105158)
+++ content/renderer/pepper_platform_context_3d_impl.cc	(working copy)
@@ -12,6 +12,7 @@
 #include "googleurl/src/gurl.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
+#include "ui/gfx/gl/gpu_preference.h"
 
 #ifdef ENABLE_GPU
 
@@ -99,7 +100,8 @@
       NULL,
       "*",
       attribs,
-      GURL::EmptyGURL());
+      GURL::EmptyGURL(),
+      gfx::PreferDiscreteGpu);
   if (!command_buffer_)
     return false;