Merge 193302 "Force GPU switch with CGLSetVirtualScreen only for..."

ui/gl/gl_context.h

Index: ui/gl/gl_context.h
===================================================================
--- ui/gl/gl_context.h	(revision 194412)
+++ ui/gl/gl_context.h	(working copy)
@@ -61,6 +61,10 @@
   // to get the exact amount of GPU memory.
   virtual bool GetTotalGpuMemory(size_t* bytes);
 
+  // Indicate that it is safe to force this context to switch GPUs, since
+  // transitioning can cause corruption and hangs (OS X only).
+  virtual void SetSafeToForceGpuSwitch();
+
   // Returns whether the current context supports the named extension. The
   // context must be current.
   bool HasExtension(const char* name);