Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/common/gles2_cmd_format_autogen.h

 // Copyright 2014 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 15660 matching lines @@
               "offset of SwapBuffersWithDamageCHROMIUM header should be 0");
 static_assert(offsetof(SwapBuffersWithDamageCHROMIUM, x) == 4,
               "offset of SwapBuffersWithDamageCHROMIUM x should be 4");
 static_assert(offsetof(SwapBuffersWithDamageCHROMIUM, y) == 8,
               "offset of SwapBuffersWithDamageCHROMIUM y should be 8");
 static_assert(offsetof(SwapBuffersWithDamageCHROMIUM, width) == 12,
               "offset of SwapBuffersWithDamageCHROMIUM width should be 12");
 static_assert(offsetof(SwapBuffersWithDamageCHROMIUM, height) == 16,
               "offset of SwapBuffersWithDamageCHROMIUM height should be 16");
 
+struct PerformanceHintCHROMIUM {
+  typedef PerformanceHintCHROMIUM ValueType;
+  static const CommandId kCmdId = kPerformanceHintCHROMIUM;
+  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
+  static const uint8_t cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(3);
+
+  static uint32_t ComputeSize() {
+    return static_cast<uint32_t>(sizeof(ValueType));  // NOLINT
+  }
+
+  void SetHeader() { header.SetCmd<ValueType>(); }
+
+  void Init(GLenum _mode) {
+    SetHeader();
+    mode = _mode;
+  }
+
+  void* Set(void* cmd, GLenum _mode) {
+    static_cast<ValueType*>(cmd)->Init(_mode);
+    return NextCmdAddress<ValueType>(cmd);
+  }
+
+  gpu::CommandHeader header;
+  uint32_t mode;
+};
+
+static_assert(sizeof(PerformanceHintCHROMIUM) == 8,
+              "size of PerformanceHintCHROMIUM should be 8");
+static_assert(offsetof(PerformanceHintCHROMIUM, header) == 0,
+              "offset of PerformanceHintCHROMIUM header should be 0");
+static_assert(offsetof(PerformanceHintCHROMIUM, mode) == 4,
+              "offset of PerformanceHintCHROMIUM mode should be 4");
+
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_AUTOGEN_H_