Implement Discard and EnsureBackbufferCHROMIUM using command buffer instead of IPC.

gpu/command_buffer/client/gles2_implementation_unittest_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!
 
 // This file is included by gles2_implementation.h to declare the
 // GL api functions.
@@ skipping 1637 matching lines @@
 TEST_F(GLES2ImplementationTest, VertexAttribDivisorANGLE) {
   struct Cmds {
     VertexAttribDivisorANGLE cmd;
   };
   Cmds expected;
   expected.cmd.Init(1, 2);
 
   gl_->VertexAttribDivisorANGLE(1, 2);
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
+
+TEST_F(GLES2ImplementationTest, DiscardBackbufferCHROMIUM) {
+  struct Cmds {
+    DiscardBackbufferCHROMIUM cmd;
+  };
+  Cmds expected;
+  expected.cmd.Init();
+
+  gl_->DiscardBackbufferCHROMIUM();
+  EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
+}
+
+TEST_F(GLES2ImplementationTest, EnsureBackbufferCHROMIUM) {
+  struct Cmds {
+    EnsureBackbufferCHROMIUM cmd;
+  };
+  Cmds expected;
+  expected.cmd.Init();
+
+  gl_->EnsureBackbufferCHROMIUM();
+  EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
+}
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_UNITTEST_AUTOGEN_H_