Scale the ALPHA_THRESHOLD filter's region based on the device scale factor.

cc/quads/render_pass_draw_quad.cc

Index: cc/quads/render_pass_draw_quad.cc
diff --git a/cc/quads/render_pass_draw_quad.cc b/cc/quads/render_pass_draw_quad.cc
index 91cb6aaa3e0350796c8835a8b85e3b4c64ee35e6..b05e8d35f6ab5ab9c47403f9ca15f65316632add 100644
--- a/cc/quads/render_pass_draw_quad.cc
+++ b/cc/quads/render_pass_draw_quad.cc
@@ -44,16 +44,26 @@ void RenderPassDrawQuad::SetNew(
     const gfx::Rect& contents_changed_since_last_frame,
     const gfx::RectF& mask_uv_rect,
     const FilterOperations& filters,
-    const FilterOperations& background_filters) {
+    const FilterOperations& background_filters,
+    const gfx::Vector2dF& scale) {
   DCHECK_GT(render_pass_id.layer_id, 0);
   DCHECK_GE(render_pass_id.index, 0);
 
   gfx::Rect opaque_rect;
   bool needs_blending = false;
-  SetAll(shared_quad_state, rect, opaque_rect, visible_rect, needs_blending,
-         render_pass_id, is_replica, mask_resource_id,
-         contents_changed_since_last_frame, mask_uv_rect, filters,
-         background_filters);
+  SetAll(shared_quad_state,
+         rect,
+         opaque_rect,
+         visible_rect,
+         needs_blending,
+         render_pass_id,
+         is_replica,
+         mask_resource_id,
+         contents_changed_since_last_frame,
+         mask_uv_rect,
+         filters,
+         background_filters,
+         scale);
 }
 
 void RenderPassDrawQuad::SetAll(
@@ -68,7 +78,8 @@ void RenderPassDrawQuad::SetAll(
     const gfx::Rect& contents_changed_since_last_frame,
     const gfx::RectF& mask_uv_rect,
     const FilterOperations& filters,
-    const FilterOperations& background_filters) {
+    const FilterOperations& background_filters,
+    const gfx::Vector2dF& scale) {
   DCHECK_GT(render_pass_id.layer_id, 0);
   DCHECK_GE(render_pass_id.index, 0);
 
@@ -81,6 +92,7 @@ void RenderPassDrawQuad::SetAll(
   this->mask_uv_rect = mask_uv_rect;
   this->filters = filters;
   this->background_filters = background_filters;
+  this->scale = scale;
 }
 
 void RenderPassDrawQuad::IterateResources(
@@ -105,6 +117,7 @@ void RenderPassDrawQuad::ExtendValue(base::DictionaryValue* value) const {
   value->Set("mask_uv_rect", MathUtil::AsValue(mask_uv_rect).release());
   value->Set("filters", filters.AsValue().release());
   value->Set("background_filters", background_filters.AsValue().release());
+  value->Set("scale", MathUtil::AsValue(scale).release());
 }
 
 }  // namespace cc