cc: Make LayerTreeTests use a DelegatingRenderer and Display.

cc/surfaces/display_client.h

Index: cc/surfaces/display_client.h
diff --git a/cc/surfaces/display_client.h b/cc/surfaces/display_client.h
index 8f7be8b9714cdb5cf826021f4ed94364daed5b91..432b44ac5c8d6708efb07920056ab13bd071c4e0 100644
--- a/cc/surfaces/display_client.h
+++ b/cc/surfaces/display_client.h
@@ -5,6 +5,8 @@
 #ifndef CC_SURFACES_DISPLAY_CLIENT_H_
 #define CC_SURFACES_DISPLAY_CLIENT_H_
 
+#include "cc/quads/render_pass.h"
+
 namespace cc {
 struct ManagedMemoryPolicy;
 
@@ -13,6 +15,9 @@ class DisplayClient {
   virtual ~DisplayClient() {}
   virtual void DisplayOutputSurfaceLost() = 0;
   virtual void DisplaySetMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
+  virtual void DisplayWillDrawAndSwap(bool will_draw_and_swap,
+                                      const RenderPassList& render_passes) = 0;
+  virtual void DisplayDidDrawAndSwap() = 0;
 };
 
 }  // namespace cc