Implement HiDPI and pinch-zoom scaling of filter params

cc/base/math_util.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/base/math_util.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 588 matching lines @@
   return res.PassAs<base::Value>();
 }
 
 scoped_ptr<base::Value> MathUtil::AsValue(const gfx::Vector2d& v) {
   scoped_ptr<base::ListValue> res(new base::ListValue());
   res->AppendInteger(v.x());
   res->AppendInteger(v.y());
   return res.PassAs<base::Value>();
 }
 
+scoped_ptr<base::Value> MathUtil::AsValue(const gfx::Vector2dF& v) {
+  scoped_ptr<base::ListValue> res(new base::ListValue());
+  res->AppendDouble(v.x());
+  res->AppendDouble(v.y());
+  return res.PassAs<base::Value>();
+}
+
 scoped_ptr<base::Value> MathUtil::AsValue(const gfx::QuadF& q) {
   scoped_ptr<base::ListValue> res(new base::ListValue());
   res->AppendDouble(q.p1().x());
   res->AppendDouble(q.p1().y());
   res->AppendDouble(q.p2().x());
   res->AppendDouble(q.p2().y());
   res->AppendDouble(q.p3().x());
   res->AppendDouble(q.p3().y());
   res->AppendDouble(q.p4().x());
   res->AppendDouble(q.p4().y());
@@ skipping 34 matching lines @@
   return scoped_ptr<base::Value>(new base::FundamentalValue(
       std::min(value, std::numeric_limits<double>::max())));
 }
 
 scoped_ptr<base::Value> MathUtil::AsValueSafely(float value) {
   return scoped_ptr<base::Value>(new base::FundamentalValue(
       std::min(value, std::numeric_limits<float>::max())));
 }
 
 }  // namespace cc