ui: Add sub region copy support to GLImage::CopyTexImage.

content/common/gpu/stream_texture_android.cc

Index: content/common/gpu/stream_texture_android.cc
diff --git a/content/common/gpu/stream_texture_android.cc b/content/common/gpu/stream_texture_android.cc
index ff625316289a97916fe73e1cccf319be28bdce89..9d65bcdf4e0d96e049e6c0d68fb4d7db6181968c 100644
--- a/content/common/gpu/stream_texture_android.cc
+++ b/content/common/gpu/stream_texture_android.cc
@@ -206,7 +206,9 @@ void StreamTexture::ReleaseTexImage(unsigned target) {
   NOTREACHED();
 }
 
-bool StreamTexture::CopyTexImage(unsigned target) {
+bool StreamTexture::CopyTexSubImage(unsigned target,
+                                    const gfx::Point& offset,
+                                    const gfx::Rect& rect) {
   return false;
 }