Canvas2d: addHitRegion() should take clipping region into account.

third_party/WebKit/Source/modules/canvas2d/ClipList.cpp

Index: third_party/WebKit/Source/modules/canvas2d/ClipList.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/ClipList.cpp b/third_party/WebKit/Source/modules/canvas2d/ClipList.cpp
index 427a26a9c9ce37a81a95c97965c249be2790aa66..7443df76139ab1d397f736ea4ea94cd9e9e761b8 100644
--- a/third_party/WebKit/Source/modules/canvas2d/ClipList.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/ClipList.cpp
@@ -6,6 +6,7 @@
 
 #include "platform/transforms/AffineTransform.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/pathops/SkPathOps.h"
 
 namespace blink {
 
@@ -27,6 +28,15 @@ void ClipList::playback(SkCanvas* canvas) const
     }
 }
 
+SkPath ClipList::intersectPathWithClip(const SkPath& path) const
+{
+    SkPath total = path;
+    for (const ClipOp* it = m_clipList.begin(); it < m_clipList.end(); it++) {
+        Op(total, it->m_path, SkPathOp::kIntersect_SkPathOp, &total);
+    }
+    return total;
+}
+
 ClipList::ClipOp::ClipOp()
     : m_antiAliasingMode(AntiAliased)
 { }