Fix TexImage2D clearing too agressively

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.h

 // Copyright (c) 2011 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_BASE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_BASE_H_
 
 #include "gpu/command_buffer/common/gl_mock.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ skipping 264 matching lines @@
   void DoDeleteProgram(GLuint client_id, GLuint service_id);
   void DoDeleteRenderbuffer(GLuint client_id, GLuint service_id);
   void DoDeleteShader(GLuint client_id, GLuint service_id);
   void DoDeleteTexture(GLuint client_id, GLuint service_id);
 
   void DoTexImage2D(
       GLenum target, GLint level, GLenum internal_format,
       GLsizei width, GLsizei height, GLint border,
       GLenum format, GLenum type,
       uint32 shared_memory_id, uint32 shared_memory_offset);
+  void DoTexImage2DSameSize(
+      GLenum target, GLint level, GLenum internal_format,
+      GLsizei width, GLsizei height, GLint border,
+      GLenum format, GLenum type,
+      uint32 shared_memory_id, uint32 shared_memory_offset);
   void DoRenderbufferStorage(
       GLenum target, GLenum internal_format, GLenum actual_format,
       GLsizei width, GLsizei height, GLenum error);
   void DoFramebufferRenderbuffer(
       GLenum target,
       GLenum attachment,
       GLenum renderbuffer_target,
       GLuint renderbuffer_client_id,
       GLuint renderbuffer_service_id,
       GLenum error);
@@ skipping 173 matching lines @@
  protected:
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_BASE_H_