gfx: Fix ToEnclosing/ToEnclosed math to deal with big numbers.

ui/gfx/geometry/rect.h

Index: ui/gfx/geometry/rect.h
diff --git a/ui/gfx/geometry/rect.h b/ui/gfx/geometry/rect.h
index 241ff3cf2d1d941732ddb6332a85bfe530b6c128..95251e931122887261cd0927318d0c52a8f04807 100644
--- a/ui/gfx/geometry/rect.h
+++ b/ui/gfx/geometry/rect.h
@@ -245,6 +245,15 @@ inline Rect ScaleToEnclosingRect(const Rect& rect, float scale) {
   return ScaleToEnclosingRect(rect, scale, scale);
 }
 
+// Returns the smallest Rect that encloses the given Rect after scaling by
+// scale. If the result is scaling would make any dimension of the rect be too

[danakj, 2015/06/15 19:13:47]

result from

+// big to be represented by an integer, then use the largest integer for that
+// dimension.
+// Note that the resulting rect x(), y(), width(), height(), right(), bottom()
+// will all return valid integer values. This means that if x() is max_int,
+// then width would() have to be 0 in order for right() to be max_int.
+GFX_EXPORT Rect SafelyScaleToEnclosingRect(const Rect& rect, float scale);

[danakj, 2015/06/15 19:13:47]

Should we be returning a bool equivalent of |clipped| in MathUtil stuff? Like
here's a rect but it's not actually enclosing. GLHF.

+
 inline Rect ScaleToEnclosedRect(const Rect& rect,
                                 float x_scale,
                                 float y_scale) {