Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 300fc739ee5999aaf99446c547e43e3fb3342f52..24091ef4713fba26cf906da98ad99b3ad3e2c9c7 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -3194,4 +3194,12 @@ void SwapBuffersWithDamageCHROMIUM(GLint x,
   }
 }
 
+void PerformanceHintCHROMIUM(GLenum mode) {
+  gles2::cmds::PerformanceHintCHROMIUM* c =
+      GetCmdSpace<gles2::cmds::PerformanceHintCHROMIUM>();
+  if (c) {
+    c->Init(mode);
+  }
+}
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_