ui: Remove gfx::Size::ClampToNonNegative, prevent negative sizes always.

ui/base/gestures/gesture_sequence.cc

Index: ui/base/gestures/gesture_sequence.cc
diff --git a/ui/base/gestures/gesture_sequence.cc b/ui/base/gestures/gesture_sequence.cc
index c4a6d316fa7718f584d9cd3fd22108110c3ef5e4..befae4ed9700a90c9057814a20b10b2c4bc6c174 100644
--- a/ui/base/gestures/gesture_sequence.cc
+++ b/ui/base/gestures/gesture_sequence.cc
@@ -588,6 +588,7 @@ void GestureSequence::RecreateBoundingBox() {
   } else {

[sadrul, 2012/11/12 01:28:02]

You can set bounding_box_ to empty when point_count_ == 0 (so you don't need to
use empty_box below)

[danakj, 2012/11/12 05:45:56]

Done.

     int left = INT_MAX / 20, top = INT_MAX / 20;
     int right = INT_MIN / 20, bottom = INT_MIN / 20;
+    bool empty_box = true;
     for (int i = 0; i < kMaxGesturePoints; ++i) {
       if (!points_[i].in_use())
         continue;
@@ -600,8 +601,12 @@ void GestureSequence::RecreateBoundingBox() {
       right = std::max(right, point.x());
       top = std::min(top, point.y());
       bottom = std::max(bottom, point.y());
+      empty_box = false;
     }
-    bounding_box_.SetRect(left, top, right - left, bottom - top);
+    if (empty_box)
+      bounding_box_.SetRect(0, 0, 0, 0);
+    else
+      bounding_box_.SetRect(left, top, right - left, bottom - top);
   }
 }