Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/gl_renderer_unittest.cc

Index: cc/output/gl_renderer_unittest.cc
diff --git a/cc/output/gl_renderer_unittest.cc b/cc/output/gl_renderer_unittest.cc
index e2a825ae10c5854f2d7aea05761c24e5ec63d800..78184d956f63811a19401e4ca3424170731fe290 100644
--- a/cc/output/gl_renderer_unittest.cc
+++ b/cc/output/gl_renderer_unittest.cc
@@ -1232,6 +1232,8 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
       skia::AdoptRef(new SkColorMatrixFilter(matrix)));
   skia::RefPtr<SkImageFilter> filter = skia::AdoptRef(
       SkColorFilterImageFilter::Create(color_filter.get(), NULL));
+  FilterOperations filters;
+  filters.Append(FilterOperation::CreateReferenceFilter(filter));
 
   gfx::Transform transform_causing_aa;
   transform_causing_aa.Rotate(20.0);
@@ -1248,7 +1250,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   AddRenderPassQuad(root_pass,
                     child_pass,
                     0,
-                    skia::RefPtr<SkImageFilter>(),
+                    FilterOperations(),
                     gfx::Transform());
 
   renderer_->DecideRenderPassAllocationsForFrame(
@@ -1266,7 +1268,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   root_pass = AddRenderPass(
       render_passes, root_pass_id, viewport_rect, gfx::Transform());
 
-  AddRenderPassQuad(root_pass, child_pass, 0, filter, gfx::Transform());
+  AddRenderPassQuad(root_pass, child_pass, 0, filters, gfx::Transform());
 
   renderer_->DecideRenderPassAllocationsForFrame(
       *renderer_client_.render_passes_in_draw_order());
@@ -1286,7 +1288,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   AddRenderPassQuad(root_pass,
                     child_pass,
                     mask,
-                    skia::RefPtr<SkImageFilter>(),
+                    FilterOperations(),
                     gfx::Transform());
 
   renderer_->DecideRenderPassAllocationsForFrame(
@@ -1304,7 +1306,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   root_pass = AddRenderPass(
       render_passes, root_pass_id, viewport_rect, gfx::Transform());
 
-  AddRenderPassQuad(root_pass, child_pass, mask, filter, gfx::Transform());
+  AddRenderPassQuad(root_pass, child_pass, mask, filters, gfx::Transform());
 
   renderer_->DecideRenderPassAllocationsForFrame(
       *renderer_client_.render_passes_in_draw_order());
@@ -1324,7 +1326,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   AddRenderPassQuad(root_pass,
                     child_pass,
                     0,
-                    skia::RefPtr<SkImageFilter>(),
+                    FilterOperations(),
                     transform_causing_aa);
 
   renderer_->DecideRenderPassAllocationsForFrame(
@@ -1342,7 +1344,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   root_pass = AddRenderPass(
       render_passes, root_pass_id, viewport_rect, gfx::Transform());
 
-  AddRenderPassQuad(root_pass, child_pass, 0, filter, transform_causing_aa);
+  AddRenderPassQuad(root_pass, child_pass, 0, filters, transform_causing_aa);
 
   renderer_->DecideRenderPassAllocationsForFrame(
       *renderer_client_.render_passes_in_draw_order());
@@ -1359,7 +1361,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   root_pass = AddRenderPass(render_passes, root_pass_id, viewport_rect,
       gfx::Transform());
 
-  AddRenderPassQuad(root_pass, child_pass, mask, skia::RefPtr<SkImageFilter>(),
+  AddRenderPassQuad(root_pass, child_pass, mask, FilterOperations(),
       transform_causing_aa);
 
   renderer_->DecideRenderPassAllocationsForFrame(
@@ -1377,7 +1379,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadShaderPermutations) {
   root_pass = AddRenderPass(render_passes, root_pass_id, viewport_rect,
       transform_causing_aa);
 
-  AddRenderPassQuad(root_pass, child_pass, mask, filter, transform_causing_aa);
+  AddRenderPassQuad(root_pass, child_pass, mask, filters, transform_causing_aa);
 
   renderer_->DecideRenderPassAllocationsForFrame(
       *renderer_client_.render_passes_in_draw_order());
@@ -1425,7 +1427,7 @@ TEST_F(GLRendererShaderTest, DrawRenderPassQuadSkipsAAForClippingTransform) {
   AddRenderPassQuad(root_pass,
                     child_pass,
                     0,
-                    skia::RefPtr<SkImageFilter>(),
+                    FilterOperations(),
                     transform_preventing_aa);
 
   renderer_->DecideRenderPassAllocationsForFrame(