Update from https://crrev.com/306655

ui/gl/gl_context.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GL_GL_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
 
   // Returns in bytes the total amount of GPU memory for the GPU which this
   // context is currently rendering on. Returns false if no extension exists
   // 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();
 
+  // 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();
 
   // Returns whether the current context supports the named extension. The
   // context must be current.
   bool HasExtension(const char* name);
 
   // Returns version info of the underlying GL context. The context must be
   // current.
@@ skipping 87 matching lines @@
 
   void SetCurrent(GLSurface* surface) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLContextReal);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_CONTEXT_H_