exo: Allow updating cc::Surface viewport and crop state independently.

components/exo/surface.h

Index: components/exo/surface.h
diff --git a/components/exo/surface.h b/components/exo/surface.h
index 111b4d80ecc106f352d6c1b975c8670f01dda1e7..016fe113fd6c175dbcb01257c4cceededf6712ea 100644
--- a/components/exo/surface.h
+++ b/components/exo/surface.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "cc/resources/transferable_resource.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ -257,7 +258,7 @@ class Surface : public aura::Window,
   cc::SurfaceId surface_id_;
 
   // The next resource id the buffer will be attached to.
-  int next_resource_id_ = 0;
+  int next_resource_id_ = 1;
 
   // The damage region to schedule paint for when Commit() is called.
   SkRegion pending_damage_;
@@ -315,6 +316,9 @@ class Surface : public aura::Window,
   // The buffer that is currently set as content of surface.
   base::WeakPtr<Buffer> current_buffer_;
 
+  // The last resource that was sent to a surface.
+  cc::TransferableResource current_resource_;
+
   // The active input region used for hit testing.
   SkRegion input_region_;