cc: Set tile manager memory policy in initializeRenderer.

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index b6d30bf38bfebd1c176219f494aeb01a3afb5d28..fd7811ccdb559a0a9e123eeb006c2a1d6cefb6eb 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -608,7 +608,6 @@ void ThreadProxy::ScheduledActionBeginFrame() {
       new BeginFrameAndCommitState);
   begin_frame_state->monotonic_frame_begin_time = base::TimeTicks::Now();
   begin_frame_state->scroll_info = layer_tree_host_impl_->ProcessScrollDeltas();
-  DCHECK_GT(layer_tree_host_impl_->memory_allocation_limit_bytes(), 0u);

[ccameron, 2013/04/30 18:52:00]

This assert seems important to me. We shouldn't be trying to draw a frame with
no memory available (the GpuMemoryManager always gives out at least some memory)

   begin_frame_state->memory_allocation_limit_bytes =
       layer_tree_host_impl_->memory_allocation_limit_bytes();
   Proxy::MainThread()->PostTask(base::Bind(&ThreadProxy::BeginFrame,