cc: Rename TileTaskClient interface to RasterBufferProvider.

cc/test/fake_tile_manager.cc

Index: cc/test/fake_tile_manager.cc
diff --git a/cc/test/fake_tile_manager.cc b/cc/test/fake_tile_manager.cc
index b76cd17654e9c6cd56977e9d4c5e7a46d3cd5579..ebc0b70a51bfc3dcab4e50cce76172bccf2a0675 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -19,7 +19,8 @@ namespace cc {
 
 namespace {
 
-class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
+class FakeTileTaskRunnerImpl : public TileTaskRunner,
+                               public RasterBufferProvider {
  public:
   // Overridden from TileTaskRunner:
   void Shutdown() override {}
@@ -52,8 +53,9 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
   bool GetResourceRequiresSwizzle(bool must_support_alpha) const override {
     return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
   }
+  RasterBufferProvider* AsRasterBufferProvider() override { return this; }
 
-  // Overridden from TileTaskClient:
+  // Overridden from RasterBufferProvider:
   std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource,
       uint64_t resource_content_id,