Convert view manager to surfaces with uploading shim in client lib

mojo/services/public/interfaces/view_manager/view_manager.mojom

Index: mojo/services/public/interfaces/view_manager/view_manager.mojom
diff --git a/mojo/services/public/interfaces/view_manager/view_manager.mojom b/mojo/services/public/interfaces/view_manager/view_manager.mojom
index d1a7f4d97189281d989108e5671c29f74da50118..ad130c86a0bbd56c4df6caadd0a6c9c49103b2cf 100644
--- a/mojo/services/public/interfaces/view_manager/view_manager.mojom
+++ b/mojo/services/public/interfaces/view_manager/view_manager.mojom
@@ -5,6 +5,7 @@
 import "mojo/public/interfaces/application/service_provider.mojom"
 import "mojo/services/public/interfaces/geometry/geometry.mojom"
 import "mojo/services/public/interfaces/input_events/input_events.mojom"
+import "mojo/services/public/interfaces/surfaces/surface_id.mojom"
 import "mojo/services/public/interfaces/view_manager/view_manager_constants.mojom"
 
 module mojo {
@@ -100,10 +101,8 @@ interface ViewManagerService {
   // search (pre-order).
   GetViewTree(uint32 view_id) => (ViewData?[]? views);
 
-  // Shows the specified image (png encoded) in the specified view.
-  SetViewContents(uint32 view_id,
-                  handle<shared_buffer>? buffer,
-                  uint32 buffer_size) => (bool success);
+  // Shows the surface in the specified view.
+  SetViewSurfaceId(uint32 view_id, SurfaceId surface_id) => (bool success);
 
   // Embeds the app for |url| in the specified view. More specifically this
   // creates a new connection to the specified url, expecting to get a