WIP GPU scheduler + delayed activation / tile draw

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 38d086ded899777379b128abdf11d89ead00f17a..131d58886f4e58fbe74d6cc2002bd8245421b06d 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -18,6 +18,7 @@
 #include <vector>
 
 #include "base/callback.h"
+#include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/threading/thread_checker.h"
@@ -162,6 +163,9 @@ class CC_EXPORT ResourceProvider
   void GenerateSyncTokenForResource(ResourceId resource_id);
   void GenerateSyncTokenForResources(const ResourceIdArray& resource_ids);
 
+  gpu::SyncToken GetSyncTokenForResource(ResourceId resource_id);
+  gpu::SyncToken GetSyncTokenForResources(const ResourceIdArray& resource_ids);
+
   // Creates accounting for a child. Returns a child ID.
   int CreateChild(const ReturnCallback& return_callback);
 
@@ -192,7 +196,8 @@ class CC_EXPORT ResourceProvider
   // NOTE: if the sync_token is set on any TransferableResource, this will
   // wait on it.
   void ReceiveFromChild(
-      int child, const TransferableResourceArray& transferable_resources);
+      int child,
+      const TransferableResourceArray& transferable_resources);
 
   // Once a set of resources have been received, they may or may not be used.
   // This declares what set of resources are currently in use from the child,
@@ -273,6 +278,8 @@ class CC_EXPORT ResourceProvider
 
     const TextureMailbox& mailbox() const { return mailbox_; }
 
+    const gpu::SyncToken& sync_token() const { return sync_token_; }
+
     void set_sync_token(const gpu::SyncToken& sync_token) {
       sync_token_ = sync_token;
       has_sync_token_ = true;
@@ -712,6 +719,8 @@ class CC_EXPORT ResourceProvider
   // resource providers.
   int tracing_id_;
 
+  base::WeakPtrFactory<ResourceProvider> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };