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 3bcdafe5a16b01f3e783a01f719c8c3b25df0350..8c22cd5e3c84c4539dcfaa098eb5531f62ad2603 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"
@@ -238,6 +239,8 @@ class Surface : public aura::Window,
   // effect next time Commit() is called.
   bool has_pending_contents_;
 
+  bool changed_viewport_or_crop_ = false;
+
   // The buffer that will become the content of surface when Commit() is called.
   base::WeakPtr<Buffer> pending_buffer_;
 
@@ -249,7 +252,7 @@ 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_;
@@ -301,6 +304,9 @@ 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_;