gpu: Extend CopyTextureCHROMIUM with support for copying part of source texture.

mojo/gpu/mojo_gles2_impl_autogen.h

Index: mojo/gpu/mojo_gles2_impl_autogen.h
diff --git a/mojo/gpu/mojo_gles2_impl_autogen.h b/mojo/gpu/mojo_gles2_impl_autogen.h
index d6be89294ac76ae9ff23897b13fccbd4eb6c7bbe..8b242d76fcbf58039e3880d946b3f72480e88cac 100644
--- a/mojo/gpu/mojo_gles2_impl_autogen.h
+++ b/mojo/gpu/mojo_gles2_impl_autogen.h
@@ -691,7 +691,11 @@ class MojoGLES2Impl : public gpu::gles2::GLES2Interface {
                               GLenum source_id,
                               GLenum dest_id,
                               GLint xoffset,
-                              GLint yoffset) override;
+                              GLint yoffset,
+                              GLint x,
+                              GLint y,
+                              GLsizei width,
+                              GLsizei height) override;
   void DrawArraysInstancedANGLE(GLenum mode,
                                 GLint first,
                                 GLsizei count,