Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc
index 9e6c461650cbbfca311879615036975c7e654ddf..05b10f8904238619a6260209f5a1dd63f609109b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_handlers_autogen.cc
@@ -4153,5 +4153,19 @@ error::Error GLES2DecoderPassthroughImpl::HandleOverlayPromotionHintCHROMIUM(
   return error::kNoError;
 }
 
+error::Error GLES2DecoderPassthroughImpl::HandlePerformanceHintCHROMIUM(
+    uint32_t immediate_data_size,
+    const volatile void* cmd_data) {
+  const volatile gles2::cmds::PerformanceHintCHROMIUM& c =
+      *static_cast<const volatile gles2::cmds::PerformanceHintCHROMIUM*>(
+          cmd_data);
+  GLenum mode = static_cast<GLenum>(c.mode);
+  error::Error error = DoPerformanceHintCHROMIUM(mode);
+  if (error != error::kNoError) {
+    return error;
+  }
+  return error::kNoError;
+}
+
 }  // namespace gles2
 }  // namespace gpu