cc: Make tiling interest rect calc based on viewport.

cc/resources/picture_layer_tiling.cc

Index: cc/resources/picture_layer_tiling.cc
diff --git a/cc/resources/picture_layer_tiling.cc b/cc/resources/picture_layer_tiling.cc
index 30a73b8e8dbf1e47e6332878a0d18810512a4518..85733c3fc2374add6135e55c803368741792e2fb 100644
--- a/cc/resources/picture_layer_tiling.cc
+++ b/cc/resources/picture_layer_tiling.cc
@@ -32,23 +32,23 @@ scoped_ptr<PictureLayerTiling> PictureLayerTiling::Create(
     float contents_scale,
     scoped_refptr<RasterSource> raster_source,
     PictureLayerTilingClient* client,
-    size_t max_tiles_for_interest_area,
+    size_t max_interest_area,
     float skewport_target_time_in_seconds,
     int skewport_extrapolation_limit_in_content_pixels) {
-  return make_scoped_ptr(new PictureLayerTiling(
-      contents_scale, raster_source, client, max_tiles_for_interest_area,
-      skewport_target_time_in_seconds,
-      skewport_extrapolation_limit_in_content_pixels));
+  return make_scoped_ptr(
+      new PictureLayerTiling(contents_scale, raster_source, client,
+                             max_interest_area, skewport_target_time_in_seconds,
+                             skewport_extrapolation_limit_in_content_pixels));
 }
 
 PictureLayerTiling::PictureLayerTiling(
     float contents_scale,
     scoped_refptr<RasterSource> raster_source,
     PictureLayerTilingClient* client,
-    size_t max_tiles_for_interest_area,
+    size_t max_interest_area,
     float skewport_target_time_in_seconds,
     int skewport_extrapolation_limit_in_content_pixels)
-    : max_tiles_for_interest_area_(max_tiles_for_interest_area),
+    : max_interest_area_(max_interest_area),
       skewport_target_time_in_seconds_(skewport_target_time_in_seconds),
       skewport_extrapolation_limit_in_content_pixels_(
           skewport_extrapolation_limit_in_content_pixels),
@@ -589,8 +589,7 @@ bool PictureLayerTiling::ComputeTilePriorityRects(
 
   // Calculate the eventually/live tiles rect.
   gfx::Size tile_size = tiling_data_.max_texture_size();
-  int64 eventually_rect_area =
-      max_tiles_for_interest_area_ * tile_size.width() * tile_size.height();
+  int64 eventually_rect_area = max_interest_area_;
 
   gfx::Rect eventually_rect =
       ExpandRectEquallyToAreaBoundedBy(visible_rect_in_content_space,