gpu: support GL_TEXTURE_CUBE_MAP destination target to Copy(Sub)TextureCHROMIUM.

gpu/command_buffer/common/gles2_cmd_utils.cc

 // 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 here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include <sstream>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
@@ skipping 791 matching lines @@
     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
       return 4;
     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
       return 5;
     default:
       NOTREACHED();
       return 0;
   }
 }
 
+uint32_t GLES2Util::GLTextureTargetToBindingTarget(uint32_t textarget) {
+  switch (textarget) {
+    case GL_TEXTURE_2D:
+    case GL_TEXTURE_EXTERNAL_OES:
+    case GL_TEXTURE_RECTANGLE_ARB:
+    case GL_TEXTURE_3D:
+    case GL_TEXTURE_2D_ARRAY:
+      return textarget;
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
+      return GL_TEXTURE_CUBE_MAP;
+    default:
+      NOTREACHED();
+      return GL_TEXTURE_2D;
+  }
+}
+
 uint32 GLES2Util::GetGLReadPixelsImplementationFormat(
     uint32 internal_format) {
   switch (internal_format) {
     case GL_R8:
     case GL_R16F:
     case GL_R32F:
       return GL_RED;
     case GL_R8UI:
     case GL_R8I:
     case GL_R16UI:
@@ skipping 526 matching lines @@
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu