Implement HiDPI and pinch-zoom scaling of filter params

cc/base/math_util.cc

Index: cc/base/math_util.cc
diff --git a/cc/base/math_util.cc b/cc/base/math_util.cc
index 25049248f297997a79edb6651cff926964b99ba6..7f6178dc60de5ec3b5c7b5a99b34200944693087 100644
--- a/cc/base/math_util.cc
+++ b/cc/base/math_util.cc
@@ -743,6 +743,12 @@ void MathUtil::AddToTracedValue(const gfx::Vector2d& v,
   res->AppendInteger(v.y());
 }
 
+void MathUtil::AddToTracedValue(const gfx::Vector2dF& v,
+                                base::debug::TracedValue* res) {
+  res->AppendDouble(v.x());
+  res->AppendDouble(v.y());
+}
+
 void MathUtil::AddToTracedValue(const gfx::QuadF& q,
                                 base::debug::TracedValue* res) {
   res->AppendDouble(q.p1().x());