Implement on demand quad rasterization for PicturePiles.

cc/resources/managed_tile_state.h

Index: cc/resources/managed_tile_state.h
diff --git a/cc/resources/managed_tile_state.h b/cc/resources/managed_tile_state.h
index 3452da75afaf10fe3d7b43ce3670245e42c67fb0..1b735dd799cabc98ff881a715dbe3ff6cff5e458 100644
--- a/cc/resources/managed_tile_state.h
+++ b/cc/resources/managed_tile_state.h
@@ -21,7 +21,7 @@ class CC_EXPORT ManagedTileState {
   class CC_EXPORT DrawingInfo {
     public:
       enum Mode {
-        TEXTURE_MODE,
+        RESOURCE_MODE,
         SOLID_COLOR_MODE,
         TRANSPARENT_MODE,
         PICTURE_PILE_MODE,
@@ -38,7 +38,7 @@ class CC_EXPORT ManagedTileState {
       bool IsReadyToDraw() const;
 
       ResourceProvider::ResourceId get_resource_id() const {
-        DCHECK(mode_ == TEXTURE_MODE);
+        DCHECK(mode_ == RESOURCE_MODE);
         DCHECK(resource_);
         DCHECK(!resource_is_being_initialized_);
         return resource_->id();
@@ -55,7 +55,7 @@ class CC_EXPORT ManagedTileState {
       }
 
       bool requires_resource() const {
-        return mode_ == TEXTURE_MODE ||
+        return mode_ == RESOURCE_MODE ||
                mode_ == PICTURE_PILE_MODE;
       }
 
@@ -67,6 +67,10 @@ class CC_EXPORT ManagedTileState {
       friend class TileManager;
       friend class ManagedTileState;
 
+      void set_use_resource() {
+        mode_ = RESOURCE_MODE;
+      }
+
       void set_transparent() {
         mode_ = TRANSPARENT_MODE;
       }
@@ -76,6 +80,14 @@ class CC_EXPORT ManagedTileState {
         solid_color_ = color;
       }
 
+      void set_rasterize_on_demand() {
+        mode_ = PICTURE_PILE_MODE;
+      }
+
+      void set_contents_swizzled(bool contents_swizzled) {
+        contents_swizzled_ = contents_swizzled;
+      }
+
       Mode mode_;
       SkColor solid_color_;