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

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index db1b35eb0ccaadeaa428bd4540771b2cc1f71e91..57c3f3b64e7d826a61232b0d7a8da0cc58e3c719 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -1986,8 +1986,9 @@ void ResourceProvider::CopyResource(ResourceId source_id, ResourceId dest_id) {
   }
   DCHECK(!dest_resource->image_id);
   dest_resource->allocated = true;
-  gl->CopySubTextureCHROMIUM(dest_resource->target, source_resource->gl_id,
-                             dest_resource->gl_id, 0, 0);
+  gl->CopySubTextureCHROMIUM(
+      dest_resource->target, source_resource->gl_id, dest_resource->gl_id, 0, 0,
+      0, 0, dest_resource->size.width(), dest_resource->size.height());
   if (source_resource->gl_read_lock_query_id) {
     // End query and create a read lock fence that will prevent access to
 // source resource until CopySubTextureCHROMIUM command has completed.