Implement hidpi and pinch-zoom scaling of filter params in cc.

cc/output/renderer_pixeltest.cc

Index: cc/output/renderer_pixeltest.cc
diff --git a/cc/output/renderer_pixeltest.cc b/cc/output/renderer_pixeltest.cc
index 1165f9a988cdfe6c58e86d82f4a4318f9b255391..b798852ec1bd390f629c0a11137245046949521b 100644
--- a/cc/output/renderer_pixeltest.cc
+++ b/cc/output/renderer_pixeltest.cc
@@ -99,6 +99,7 @@ scoped_ptr<DrawQuad> CreateTestRenderPassDrawQuad(
                rect,                  // contents_changed_since_last_frame
                gfx::RectF(1.f, 1.f),  // mask_uv_rect
                FilterOperations(),    // foreground filters
+               gfx::Vector2dF(),      // filters scale
                FilterOperations());   // background filters
 
   return quad.PassAs<DrawQuad>();
@@ -639,6 +640,7 @@ TYPED_TEST(RendererPixelTest, FastPassColorFilterAlpha) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
+                           gfx::Vector2dF(),
                            FilterOperations());
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
@@ -716,6 +718,7 @@ TYPED_TEST(RendererPixelTest, FastPassSaturateFilter) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
+                           gfx::Vector2dF(),
                            FilterOperations());
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
@@ -792,6 +795,7 @@ TYPED_TEST(RendererPixelTest, FastPassFilterChain) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
+                           gfx::Vector2dF(),
                            FilterOperations());
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
@@ -890,6 +894,7 @@ TYPED_TEST(RendererPixelTest, FastPassColorFilterAlphaTranslation) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
+                           gfx::Vector2dF(),
                            FilterOperations());
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
@@ -1112,6 +1117,7 @@ TYPED_TEST(RendererPixelTest, RenderPassAndMaskWithPartialQuad) {
                     sub_rect,              // contents_changed_since_last_frame
                     gfx::RectF(1.f, 1.f),  // mask_uv_rect
                     FilterOperations(),    // foreground filters
+                    gfx::Vector2dF(),      // filters scale
                     FilterOperations());   // background filters
   root_pass->quad_list.push_back(mask_quad.PassAs<DrawQuad>());
 
@@ -1187,6 +1193,7 @@ class RendererPixelTestWithBackgroundFilter
           filter_pass_content_rect_,  // contents_changed_since_last_frame
           gfx::RectF(),               // mask_uv_rect
           FilterOperations(),         // filters
+          gfx::Vector2dF(),           // filters_scale
           this->background_filters_);
       root_pass->quad_list.push_back(filter_pass_quad.PassAs<DrawQuad>());
       root_pass->shared_quad_state_list.push_back(shared_state.Pass());