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

ui/gfx/gl/gl_context_linux.cc

Index: ui/gfx/gl/gl_context_linux.cc
===================================================================
--- ui/gfx/gl/gl_context_linux.cc	(revision 105158)
+++ ui/gfx/gl/gl_context_linux.cc	(working copy)
@@ -24,19 +24,20 @@
 
 scoped_refptr<GLContext> GLContext::CreateGLContext(
     GLShareGroup* share_group,
-    GLSurface* compatible_surface) {
+    GLSurface* compatible_surface,
+    GpuPreference gpu_preference) {
   switch (GetGLImplementation()) {
 #if !defined(USE_WAYLAND)
     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 kGLImplementationDesktopGL: {
       scoped_refptr<GLContext> context(new GLContextGLX(share_group));
-      if (!context->Initialize(compatible_surface))
+      if (!context->Initialize(compatible_surface, gpu_preference))
         return NULL;
 
       return context;
@@ -44,7 +45,7 @@
 #endif
     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;
@@ -57,4 +58,8 @@
   }
 }
 
+bool GLContext::SupportsDualGpus() {
+  return false;
+}
+
 }  // namespace gfx