Implement Discard and EnsureBackbufferCHROMIUM using command buffer instead of IPC.

gpu/command_buffer/common/gles2_cmd_format_autogen.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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_AUTOGEN_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_AUTOGEN_H_
@@ skipping 9647 matching lines @@
 
 COMPILE_ASSERT(sizeof(VertexAttribDivisorANGLE) == 12,
                Sizeof_VertexAttribDivisorANGLE_is_not_12);
 COMPILE_ASSERT(offsetof(VertexAttribDivisorANGLE, header) == 0,
                OffsetOf_VertexAttribDivisorANGLE_header_not_0);
 COMPILE_ASSERT(offsetof(VertexAttribDivisorANGLE, index) == 4,
                OffsetOf_VertexAttribDivisorANGLE_index_not_4);
 COMPILE_ASSERT(offsetof(VertexAttribDivisorANGLE, divisor) == 8,
                OffsetOf_VertexAttribDivisorANGLE_divisor_not_8);
 
+struct DiscardBackbufferCHROMIUM {
+  typedef DiscardBackbufferCHROMIUM ValueType;
+  static const CommandId kCmdId = kDiscardBackbufferCHROMIUM;
+  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
+
+  static uint32 ComputeSize() {
+    return static_cast<uint32>(sizeof(ValueType));  // NOLINT
+  }
+
+  void SetHeader() {
+    header.SetCmd<ValueType>();
+  }
+
+  void Init() {
+    SetHeader();
+  }
+
+  void* Set(void* cmd) {
+    static_cast<ValueType*>(cmd)->Init();
+    return NextCmdAddress<ValueType>(cmd);
+  }
+
+  gpu::CommandHeader header;
+};
+
+COMPILE_ASSERT(sizeof(DiscardBackbufferCHROMIUM) == 4,
+               Sizeof_DiscardBackbufferCHROMIUM_is_not_4);
+COMPILE_ASSERT(offsetof(DiscardBackbufferCHROMIUM, header) == 0,
+               OffsetOf_DiscardBackbufferCHROMIUM_header_not_0);
+
+struct EnsureBackbufferCHROMIUM {
+  typedef EnsureBackbufferCHROMIUM ValueType;
+  static const CommandId kCmdId = kEnsureBackbufferCHROMIUM;
+  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
+
+  static uint32 ComputeSize() {
+    return static_cast<uint32>(sizeof(ValueType));  // NOLINT
+  }
+
+  void SetHeader() {
+    header.SetCmd<ValueType>();
+  }
+
+  void Init() {
+    SetHeader();
+  }
+
+  void* Set(void* cmd) {
+    static_cast<ValueType*>(cmd)->Init();
+    return NextCmdAddress<ValueType>(cmd);
+  }
+
+  gpu::CommandHeader header;
+};
+
+COMPILE_ASSERT(sizeof(EnsureBackbufferCHROMIUM) == 4,
+               Sizeof_EnsureBackbufferCHROMIUM_is_not_4);
+COMPILE_ASSERT(offsetof(EnsureBackbufferCHROMIUM, header) == 0,
+               OffsetOf_EnsureBackbufferCHROMIUM_header_not_0);
+
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_AUTOGEN_H_