cc: Make tiling interest rect calc based on viewport.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index f3f6489daee1f0e3dec61487b979322f8e8fe52d..0b4059195b9c898397371a06bcd2f0c97df52182 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -353,13 +353,14 @@ void RenderWidgetCompositor::Initialize() {
         &settings.initial_debug_state.slow_down_raster_scale_factor);
   }
 
-  if (cmd->HasSwitch(cc::switches::kMaxTilesForInterestArea)) {
-    int max_tiles_for_interest_area;
+  if (cmd->HasSwitch(cc::switches::kTilingInterestAreaViewportMultiplier)) {
+    int tiling_interest_area_viewport_multiplier;
     if (GetSwitchValueAsInt(*cmd,
-                            cc::switches::kMaxTilesForInterestArea,
+                            cc::switches::kTilingInterestAreaViewportMultiplier,
                             1, std::numeric_limits<int>::max(),
-                            &max_tiles_for_interest_area))
-      settings.max_tiles_for_interest_area = max_tiles_for_interest_area;
+                            &tiling_interest_area_viewport_multiplier))
+      settings.tiling_interest_area_viewport_multiplier =
+          tiling_interest_area_viewport_multiplier;
   }
 
   if (cmd->HasSwitch(cc::switches::kMaxUnusedResourceMemoryUsagePercentage)) {