Add the ability to clear the shader disk cache.

content/browser/storage_partition_impl.h

Index: content/browser/storage_partition_impl.h
diff --git a/content/browser/storage_partition_impl.h b/content/browser/storage_partition_impl.h
index 8537af23cac8a48772ad079e922961b34af4ed3d..6b3448e09b86d59df2b2ced24157bbbcc941e2a7 100644
--- a/content/browser/storage_partition_impl.h
+++ b/content/browser/storage_partition_impl.h
@@ -34,9 +34,15 @@ class StoragePartitionImpl : public StoragePartition {
       const GURL& storage_origin,
       net::URLRequestContextGetter* request_context_getter) OVERRIDE;
   virtual void AsyncClearData(uint32 storage_mask) OVERRIDE;
+  virtual void AsyncClearDataBetween(
+      uint32 storage_mask,
+      const base::Time& begin,
+      const base::Time& end,
+      const base::Closure& callback) OVERRIDE;
 
  private:
   friend class StoragePartitionImplMap;
+  FRIEND_TEST_ALL_PREFIXES(StoragePartitionShaderClearTest, ClearShaderCache);
 
   // The |partition_path| is the absolute path to the root of this
   // StoragePartition's on-disk storage.