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

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 2377043d45a4deba2fb650805f40eb2c9ec2376a..cc88f06ed5f0a3c293cf3a2654b6b231716049e8 100644
--- a/cc/output/renderer_pixeltest.cc
+++ b/cc/output/renderer_pixeltest.cc
@@ -103,12 +103,13 @@ scoped_ptr<DrawQuad> CreateTestRenderPassDrawQuad(
                rect,
                rect,
                pass_id,
-               false,                 // is_replica
-               0,                     // mask_resource_id
-               rect,                  // contents_changed_since_last_frame
-               gfx::RectF(1.f, 1.f),  // mask_uv_rect
-               FilterOperations(),    // foreground filters
-               FilterOperations());   // background filters
+               false,                      // is_replica
+               0,                          // mask_resource_id
+               rect,                       // contents_changed_since_last_frame
+               gfx::RectF(1.f, 1.f),       // mask_uv_rect
+               FilterOperations(),         // foreground filters
+               FilterOperations(),         // background filters
+               gfx::Vector2dF(1.f, 1.f));  // scale
 
   return quad.PassAs<DrawQuad>();
 }
@@ -834,7 +835,8 @@ TYPED_TEST(RendererPixelTest, FastPassColorFilterAlpha) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
-                           FilterOperations());
+                           FilterOperations(),
+                           gfx::Vector2dF(1.f, 1.f));
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
 
@@ -909,7 +911,8 @@ TYPED_TEST(RendererPixelTest, FastPassSaturateFilter) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
-                           FilterOperations());
+                           FilterOperations(),
+                           gfx::Vector2dF(1.f, 1.f));
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
 
@@ -983,7 +986,8 @@ TYPED_TEST(RendererPixelTest, FastPassFilterChain) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
-                           FilterOperations());
+                           FilterOperations(),
+                           gfx::Vector2dF(1.f, 1.f));  // scale
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
 
@@ -1079,7 +1083,8 @@ TYPED_TEST(RendererPixelTest, FastPassColorFilterAlphaTranslation) {
                            pass_rect,
                            gfx::RectF(),
                            filters,
-                           FilterOperations());
+                           FilterOperations(),
+                           gfx::Vector2dF(1.f, 1.f));  // scale
 
   root_pass->quad_list.push_back(render_pass_quad.PassAs<DrawQuad>());
   RenderPassList pass_list;
@@ -1289,7 +1294,9 @@ TYPED_TEST(RendererPixelTest, RenderPassAndMaskWithPartialQuad) {
                     sub_rect,              // contents_changed_since_last_frame
                     gfx::RectF(1.f, 1.f),  // mask_uv_rect
                     FilterOperations(),    // foreground filters
-                    FilterOperations());   // background filters
+                    FilterOperations(),    // background filters
+                    gfx::Vector2dF(1.f, 1.f));  // scale
+
   root_pass->quad_list.push_back(mask_quad.PassAs<DrawQuad>());
 
   // White background behind the masked render pass.
@@ -1364,7 +1371,9 @@ class RendererPixelTestWithBackgroundFilter
           filter_pass_content_rect_,  // contents_changed_since_last_frame
           gfx::RectF(),               // mask_uv_rect
           FilterOperations(),         // filters
-          this->background_filters_);
+          this->background_filters_,
+          gfx::Vector2dF(1.f, 1.f));  // scale
+
       root_pass->quad_list.push_back(filter_pass_quad.PassAs<DrawQuad>());
     }