Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/filter_operation.h

Index: cc/output/filter_operation.h
diff --git a/cc/output/filter_operation.h b/cc/output/filter_operation.h
index ad25cf48f6cb43438590b1aeb18e5782ddb2ac44..3855f4ba8c89fd56263bf19fa94a6b3eebbd0cf3 100644
--- a/cc/output/filter_operation.h
+++ b/cc/output/filter_operation.h
@@ -7,7 +7,9 @@
 
 #include "base/logging.h"
 #include "cc/base/cc_export.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/core/SkScalar.h"
 #include "ui/gfx/point.h"
 
@@ -28,13 +30,19 @@ class CC_EXPORT FilterOperation {
     DROP_SHADOW,
     COLOR_MATRIX,
     ZOOM,
+    REFERENCE,
     SATURATING_BRIGHTNESS,  // Not used in CSS/SVG.
   };
 
+  FilterOperation(const FilterOperation& other);
+
+  ~FilterOperation();
+
   FilterType type() const { return type_; }
 
   float amount() const {
     DCHECK_NE(type_, COLOR_MATRIX);
+    DCHECK_NE(type_, REFERENCE);
     return amount_;
   }
 
@@ -48,6 +56,11 @@ class CC_EXPORT FilterOperation {
     return drop_shadow_color_;
   }
 
+  skia::RefPtr<SkImageFilter> image_filter() const {
+    DCHECK_EQ(type_, REFERENCE);
+    return image_filter_;
+  }
+
   const SkScalar* matrix() const {
     DCHECK_EQ(type_, COLOR_MATRIX);
     return matrix_;
@@ -108,6 +121,11 @@ class CC_EXPORT FilterOperation {
     return FilterOperation(ZOOM, amount, inset);
   }
 
+  static FilterOperation CreateReferenceFilter(
+      const skia::RefPtr<SkImageFilter> image_filter) {
+    return FilterOperation(REFERENCE, image_filter);
+  }
+
   static FilterOperation CreateSaturatingBrightnessFilter(float amount) {
     return FilterOperation(SATURATING_BRIGHTNESS, amount);
   }
@@ -127,6 +145,7 @@ class CC_EXPORT FilterOperation {
 
   void set_amount(float amount) {
     DCHECK_NE(type_, COLOR_MATRIX);
+    DCHECK_NE(type_, REFERENCE);
     amount_ = amount;
   }
 
@@ -140,6 +159,11 @@ class CC_EXPORT FilterOperation {
     drop_shadow_color_ = color;
   }
 
+  void set_image_filter(const skia::RefPtr<SkImageFilter>& image_filter) {
+    DCHECK_EQ(type_, REFERENCE);
+    image_filter_ = image_filter;
+  }
+
   void set_matrix(const SkScalar matrix[20]) {
     DCHECK_EQ(type_, COLOR_MATRIX);
     for (unsigned i = 0; i < 20; ++i)
@@ -173,10 +197,14 @@ class CC_EXPORT FilterOperation {
 
   FilterOperation(FilterType type, float amount, int inset);
 
+  FilterOperation(FilterType type,
+                  const skia::RefPtr<SkImageFilter>& image_filter);
+
   FilterType type_;
   float amount_;
   gfx::Point drop_shadow_offset_;
   SkColor drop_shadow_color_;
+  skia::RefPtr<SkImageFilter> image_filter_;
   SkScalar matrix_[20];
   int zoom_inset_;
 };