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

content/gpu/gpu_info_collector.cc

Index: content/gpu/gpu_info_collector.cc
===================================================================
--- content/gpu/gpu_info_collector.cc	(revision 105357)
+++ content/gpu/gpu_info_collector.cc	(working copy)
@@ -32,7 +32,9 @@
 scoped_refptr<gfx::GLContext> InitializeGLContext(gfx::GLSurface* surface) {
 
   scoped_refptr<gfx::GLContext> context(
-      gfx::GLContext::CreateGLContext(NULL, surface));
+      gfx::GLContext::CreateGLContext(NULL,
+                                      surface,
+                                      gfx::PreferIntegratedGpu));
   if (!context.get()) {
     LOG(ERROR) << "gfx::GLContext::CreateGLContext failed";
     return NULL;