Update from https://crrev.com/306655

ui/gl/gl_context.h

Index: ui/gl/gl_context.h
diff --git a/ui/gl/gl_context.h b/ui/gl/gl_context.h
index 372f51380e80ce8b308b83ba3869aaf66e2750e3..cdebd686b33eea7f994c4de880d57490cd14298d 100644
--- a/ui/gl/gl_context.h
+++ b/ui/gl/gl_context.h
@@ -90,6 +90,10 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
   // transitioning can cause corruption and hangs (OS X only).
   virtual void SetSafeToForceGpuSwitch();
 
+  // Attempt to force the context to move to the GPU of its sharegroup. Return
+  // false only in the event of an unexpected error on the context.
+  virtual bool ForceGpuSwitchIfNeeded();
+
   // Indicate that the real context switches should unbind the FBO first
   // (For an Android work-around only).
   virtual void SetUnbindFboOnMakeCurrent();