Implement on demand quad rasterization for PicturePiles.

cc/resources/managed_tile_state.cc

Index: cc/resources/managed_tile_state.cc
diff --git a/cc/resources/managed_tile_state.cc b/cc/resources/managed_tile_state.cc
index fe8b192fdd736773422e68875610a70f292a5f73..5c7754897cca3d87f255a274a22082a631343f4a 100644
--- a/cc/resources/managed_tile_state.cc
+++ b/cc/resources/managed_tile_state.cc
@@ -24,7 +24,7 @@ ManagedTileState::ManagedTileState()
 }
 
 ManagedTileState::DrawingInfo::DrawingInfo()
-    : mode_(TEXTURE_MODE),
+    : mode_(RESOURCE_MODE),
       resource_is_being_initialized_(false),
       can_be_freed_(true),
       contents_swizzled_(false) {
@@ -35,7 +35,7 @@ ManagedTileState::DrawingInfo::~DrawingInfo() {
 
 bool ManagedTileState::DrawingInfo::IsReadyToDraw() const {
   switch (mode_) {
-    case TEXTURE_MODE:
+    case RESOURCE_MODE:
       return resource_ &&
              !resource_is_being_initialized_ &&
              resource_->id();