gpu: Defer reads from default framebuffer when needed.

gpu/command_buffer/service/gles2_cmd_decoder_unittest_1_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!
 
 // It is included by gles2_cmd_decoder_unittest_1.cc
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_1_AUTOGEN_H_
@@ skipping 290 matching lines @@
 
 TEST_F(GLES2DecoderTest1, CheckFramebufferStatusInvalidArgsBadSharedMemoryId) {
   EXPECT_CALL(*gl_, CheckFramebufferStatusEXT(GL_FRAMEBUFFER)).Times(0);
   SpecializedSetup<CheckFramebufferStatus, 0>(false);
   CheckFramebufferStatus cmd;
   cmd.Init(GL_FRAMEBUFFER, kInvalidSharedMemoryId, shared_memory_offset_);
   EXPECT_EQ(error::kOutOfBounds, ExecuteCmd(cmd));
   cmd.Init(GL_FRAMEBUFFER, shared_memory_id_, kInvalidSharedMemoryOffset);
   EXPECT_EQ(error::kOutOfBounds, ExecuteCmd(cmd));
 }
-// TODO(gman): Clear
 
+TEST_F(GLES2DecoderTest1, ClearValidArgs) {
+  EXPECT_CALL(*gl_, Clear(1));
+  SpecializedSetup<Clear, 0>(true);
+  Clear cmd;
+  cmd.Init(1);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
 
 TEST_F(GLES2DecoderTest1, ClearColorValidArgs) {
   EXPECT_CALL(*gl_, ClearColor(1, 2, 3, 4));
   SpecializedSetup<ClearColor, 0>(true);
   ClearColor cmd;
   cmd.Init(1, 2, 3, 4);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
@@ skipping 1524 matching lines @@
   result->size = 0;
   GetVertexAttribfv cmd;
   cmd.Init(
       1, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, shared_memory_id_,
       kInvalidSharedMemoryOffset);
   EXPECT_EQ(error::kOutOfBounds, ExecuteCmd(cmd));
   EXPECT_EQ(0u, result->size);
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_1_AUTOGEN_H_