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 380f2f6619337e1d8af761f148c32adff1df537e..bcafb03c462ec36f41e3611a438b525691551368 100644
--- a/cc/quads/render_pass_draw_quad.cc
+++ b/cc/quads/render_pass_draw_quad.cc
@@ -31,15 +31,25 @@ 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);
 }
 
@@ -55,6 +65,7 @@ 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);
@@ -67,6 +78,7 @@ 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;
 }
 
@@ -86,6 +98,7 @@ void RenderPassDrawQuad::ExtendValue(base::debug::TracedValue* value) const {
   TracedValue::SetIDRef(render_pass_id.AsTracingId(), value, "render_pass_id");
   value->SetBoolean("is_replica", is_replica);
   value->SetInteger("mask_resource_id", mask_resource_id);
+
   value->BeginArray("contents_changed_since_last_frame");
   MathUtil::AddToTracedValue(contents_changed_since_last_frame, value);
   value->EndArray();
@@ -93,10 +106,15 @@ void RenderPassDrawQuad::ExtendValue(base::debug::TracedValue* value) const {
   value->BeginArray("mask_uv_rect");
   MathUtil::AddToTracedValue(mask_uv_rect, value);
   value->EndArray();
+
   value->BeginDictionary("filters");
   filters.AsValueInto(value);
   value->EndDictionary();
 
+  value->BeginArray("filters_scale");
+  MathUtil::AddToTracedValue(filters_scale, value);
+  value->EndArray();
+
   value->BeginDictionary("background_filters");
   background_filters.AsValueInto(value);
   value->EndDictionary();