Implement HiDPI and pinch-zoom scaling of filter params

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 6259fdf4afbb57c9d3b2ac53810ec114e67a275a..7aae0a9a60743eec1162d4c23b3f6c8c1cc10805 100644
--- a/cc/quads/render_pass_draw_quad.cc
+++ b/cc/quads/render_pass_draw_quad.cc
@@ -30,15 +30,25 @@ void RenderPassDrawQuad::SetNew(
     const gfx::Rect& contents_changed_since_last_frame,
     const gfx::RectF& mask_uv_rect,
     const FilterOperations& filters,
+    const gfx::Vector2dF& filters_scale,
     const FilterOperations& background_filters) {
   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,
+  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,
+         filters_scale,
          background_filters);
 }
 
@@ -54,6 +64,7 @@ void RenderPassDrawQuad::SetAll(
     const gfx::Rect& contents_changed_since_last_frame,
     const gfx::RectF& mask_uv_rect,
     const FilterOperations& filters,
+    const gfx::Vector2dF& filters_scale,
     const FilterOperations& background_filters) {
   DCHECK_GT(render_pass_id.layer_id, 0);
   DCHECK_GE(render_pass_id.index, 0);
@@ -66,6 +77,7 @@ void RenderPassDrawQuad::SetAll(
   this->contents_changed_since_last_frame = contents_changed_since_last_frame;
   this->mask_uv_rect = mask_uv_rect;
   this->filters = filters;
+  this->filters_scale = filters_scale;
   this->background_filters = background_filters;
 }
 
@@ -90,6 +102,7 @@ void RenderPassDrawQuad::ExtendValue(base::DictionaryValue* value) const {
              MathUtil::AsValue(contents_changed_since_last_frame).release());
   value->Set("mask_uv_rect", MathUtil::AsValue(mask_uv_rect).release());
   value->Set("filters", filters.AsValue().release());
+  value->Set("filters_scale", MathUtil::AsValue(filters_scale).release());
   value->Set("background_filters", background_filters.AsValue().release());
 }