gfx: Make conversions from gfx::Point to PointF explicit.

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 6e5ac0bd45db73b47d318a7d4b3aef0f42af0078..fa7eccfb38135c6c779cee84074e22c6f13630b1 100644
--- a/cc/base/math_util.cc
+++ b/cc/base/math_util.cc
@@ -779,6 +779,15 @@ void MathUtil::AddToTracedValue(const char* name,
 }
 
 void MathUtil::AddToTracedValue(const char* name,
+                                const gfx::Point& pt,
+                                base::trace_event::TracedValue* res) {
+  res->BeginArray(name);
+  res->AppendInteger(pt.x());
+  res->AppendInteger(pt.y());
+  res->EndArray();
+}
+
+void MathUtil::AddToTracedValue(const char* name,
                                 const gfx::PointF& pt,
                                 base::trace_event::TracedValue* res) {
   res->BeginArray(name);