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

ui/gfx/gl/gl_context_win.cc

Index: ui/gfx/gl/gl_context_win.cc
===================================================================
--- ui/gfx/gl/gl_context_win.cc	(revision 105158)
+++ ui/gfx/gl/gl_context_win.cc	(working copy)
@@ -22,25 +22,26 @@
 
 scoped_refptr<GLContext> GLContext::CreateGLContext(
     GLShareGroup* share_group,
-    GLSurface* compatible_surface) {
+    GLSurface* compatible_surface,
+    GpuPreference gpu_preference) {
   switch (GetGLImplementation()) {
     case kGLImplementationOSMesaGL: {
       scoped_refptr<GLContext> context(new GLContextOSMesa(share_group));
-      if (!context->Initialize(compatible_surface))
+      if (!context->Initialize(compatible_surface, gpu_preference))
         return NULL;
 
       return context;
     }
     case kGLImplementationEGLGLES2: {
       scoped_refptr<GLContext> context(new GLContextEGL(share_group));
-      if (!context->Initialize(compatible_surface))
+      if (!context->Initialize(compatible_surface, gpu_preference))
         return NULL;
 
       return context;
     }
     case kGLImplementationDesktopGL: {
       scoped_refptr<GLContext> context(new GLContextWGL(share_group));
-      if (!context->Initialize(compatible_surface))
+      if (!context->Initialize(compatible_surface, gpu_preference))
         return NULL;
 
       return context;
@@ -53,4 +54,8 @@
   }
 }
 
+bool GLContext::SupportsDualGpus() {
+  return false;
+}
+
 }  // namespace gfx