Add glCompressedCopySubTextureCHROMIUM

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc

Index: gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
index 846ac0d6a12b9be9218a3d26a2a866fc87c67292..fda27325030b75c3fea0b1ec3d933ca2560d9953 100644
--- a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
+++ b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
@@ -471,8 +471,8 @@ void CopyTextureCHROMIUMResourceManager::DoCopyTextureInternal(
   DCHECK(source_target == GL_TEXTURE_2D ||
          source_target == GL_TEXTURE_RECTANGLE_ARB ||
          source_target == GL_TEXTURE_EXTERNAL_OES);
-  DCHECK(xoffset >= 0 && xoffset + source_width <= dest_width);
-  DCHECK(yoffset >= 0 && yoffset + source_height <= dest_height);
+  DCHECK(xoffset >= 0 && xoffset + width <= dest_width);
+  DCHECK(yoffset >= 0 && yoffset + height <= dest_height);

[reveman, 2015/08/05 16:07:40]

While here, can you split this into 4 DCHECKs instead?

DCHECK_GE(xoffset, 0);
DCHECK_LE(xoffset + width, dest_width);
....

[christiank, 2015/08/06 13:48:21]

Done.

   if (!initialized_) {
     DLOG(ERROR) << "CopyTextureCHROMIUM: Uninitialized manager.";
     return;