Add a second unsafe ES3 API in command buffer.

gpu/command_buffer/client/gles2_implementation_unittest_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 191 matching lines @@
   };
   Cmds expected;
   expected.cmd.Init(1);
 
   gl_->CompileShader(1);
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
 // TODO: Implement unit test for CompressedTexImage2D
 // TODO: Implement unit test for CompressedTexSubImage2D
 
+TEST_F(GLES2ImplementationTest, CopyBufferSubData) {
+  struct Cmds {
+    cmds::CopyBufferSubData cmd;
+  };
+  Cmds expected;
+  expected.cmd.Init(GL_ARRAY_BUFFER, GL_ARRAY_BUFFER, 3, 4, 5);
+
+  gl_->CopyBufferSubData(GL_ARRAY_BUFFER, GL_ARRAY_BUFFER, 3, 4, 5);
+  EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
+}
+
 TEST_F(GLES2ImplementationTest, CopyTexImage2D) {
   struct Cmds {
     cmds::CopyTexImage2D cmd;
   };
   Cmds expected;
   expected.cmd.Init(GL_TEXTURE_2D, 2, GL_ALPHA, 4, 5, 6, 7);
 
   gl_->CopyTexImage2D(GL_TEXTURE_2D, 2, GL_ALPHA, 4, 5, 6, 7, 0);
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
@@ skipping 1804 matching lines @@
   struct Cmds {
     cmds::MatrixLoadIdentityCHROMIUM cmd;
   };
   Cmds expected;
   expected.cmd.Init(GL_PATH_PROJECTION_CHROMIUM);
 
   gl_->MatrixLoadIdentityCHROMIUM(GL_PATH_PROJECTION_CHROMIUM);
   EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
 }
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_UNITTEST_AUTOGEN_H_