Implement cc::FilterOperations::MapRect.

cc/output/filter_operations.cc

Index: cc/output/filter_operations.cc
diff --git a/cc/output/filter_operations.cc b/cc/output/filter_operations.cc
index 396e239698a78c885175fed0c22d32dcd23aff49..ffa37bab6c45d07542b7f3578631e7839ec01a93 100644
--- a/cc/output/filter_operations.cc
+++ b/cc/output/filter_operations.cc
@@ -7,10 +7,12 @@
 #include <stddef.h>
 
 #include <cmath>
+#include <numeric>
 
 #include "base/trace_event/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/output/filter_operation.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace cc {
 
@@ -56,6 +58,14 @@ static int SpreadForStdDeviation(float std_deviation) {
   return static_cast<int>(ceilf(d * 3.f / 2.f));
 }
 
+gfx::Rect FilterOperations::MapRect(const gfx::Rect& rect) const {
+  auto accumulate_rect = [](const gfx::Rect& rect, const FilterOperation& op) {
+    return op.MapRect(rect);
+  };
+  return std::accumulate(operations_.begin(), operations_.end(), rect,
+                         accumulate_rect);
+}
+
 void FilterOperations::GetOutsets(int* top,
                                   int* right,
                                   int* bottom,