Force GPU switch with CGLSetVirtualScreen only for compositor

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index d72d5d241ee6ad18d6d046139476dea4fe4301fa..9cf216966e338fb3a07301686294a3623844c7b2 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -18,9 +18,6 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
-#if defined(OS_MACOSX)
-#include "base/mac/scoped_cftyperef.h"
-#endif
 #include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
@@ -61,7 +58,10 @@
 #include "ui/gl/gl_image.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
+
 #if defined(OS_MACOSX)
+#include "base/mac/scoped_cftyperef.h"
+#include "ui/gl/gl_context_cgl.h"
 #include "ui/surface/io_surface_support_mac.h"
 #endif
 
@@ -2573,6 +2573,11 @@ bool GLES2DecoderImpl::Initialize(
     glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
   }
 
+#if defined(OS_MACOSX)
+  if (feature_info_->workarounds().force_cgl_set_virtual_screen)
+    gfx::GLContextCGL::ForceCGLSetVirtualScreen();
+#endif
+
   // Create a delegate to perform async pixel transfers.
   async_pixel_transfer_delegate_ =
       gfx::AsyncPixelTransferDelegate::Create(context.get());