Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/client/gles2_implementation_impl_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_impl_autogen.h
diff --git a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
index eed99df1622e0dccd67b568e24f07d73b4b3d1e7..7af3b8a38220001d676d456384a0a9f52afaffea 100644
--- a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
@@ -3508,4 +3508,12 @@ void GLES2Implementation::OverlayPromotionHintCHROMIUM(GLuint texture,
   CheckGLError();
 }
 
+void GLES2Implementation::PerformanceHintCHROMIUM(GLenum mode) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glPerformanceHintCHROMIUM("
+                     << GLES2Util::GetStringPerformanceHintMode(mode) << ")");
+  helper_->PerformanceHintCHROMIUM(mode);
+  CheckGLError();
+}
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_IMPL_AUTOGEN_H_