cc: Partial tile update for one-copy raster.

cc/resources/resource_pool.h

Index: cc/resources/resource_pool.h
diff --git a/cc/resources/resource_pool.h b/cc/resources/resource_pool.h
index f79455905dd4513deb491b250a723b445c593d38..56a6ef2b7cdd164e40d054d4da367e48c8bf47d1 100644
--- a/cc/resources/resource_pool.h
+++ b/cc/resources/resource_pool.h
@@ -27,7 +27,13 @@ class CC_EXPORT ResourcePool {
 
   scoped_ptr<ScopedResource> AcquireResource(const gfx::Size& size,
                                              ResourceFormat format);
-  void ReleaseResource(scoped_ptr<ScopedResource>);
+  scoped_ptr<ScopedResource> TryAcquireOldResource(const gfx::Size& size,
+                                                   ResourceFormat format,

[reveman, 2015/05/14 23:52:20]

Why are we providing |size| and |format| when asking for a specific id?

[danakj, 2015/05/14 23:56:34]

In case the new tile has a different size/format than the previous tile did.
This makes things more robust I think?

+                                                   uint64 id);
+  scoped_ptr<ScopedResource> TryAcquireOldBusyResource(const gfx::Size& size,
+                                                       ResourceFormat format,

[reveman, 2015/05/14 23:52:20]

ditto

+                                                       uint64 id);
+  void ReleaseResource(scoped_ptr<ScopedResource> resource, uint64_t id);
 
   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
                               size_t max_unused_memory_usage_bytes,
@@ -55,7 +61,7 @@ class CC_EXPORT ResourcePool {
   bool ResourceUsageTooHigh();
 
  private:
-  void DidFinishUsingResource(ScopedResource* resource);
+  void DidFinishUsingResource(ScopedResource* resource, uint64_t id);
 
   ResourceProvider* resource_provider_;
   const GLenum target_;
@@ -66,7 +72,13 @@ class CC_EXPORT ResourcePool {
   size_t unused_memory_usage_bytes_;
   size_t resource_count_;
 
-  typedef std::list<ScopedResource*> ResourceList;
+  struct PoolResource {
+    PoolResource(ScopedResource* resource, uint64_t id)
+        : resource(resource), id(id) {}
+    ScopedResource* resource;
+    uint64_t id;
+  };
+  typedef std::list<PoolResource> ResourceList;
   ResourceList unused_resources_;
   ResourceList busy_resources_;