Fix float cast overflow in BaseRenderingContext2D::InflateStrokeRect

Bug: 837963
TBR: junov@chromium.org
Change-Id: Ifa500e548d67c87034829b51b230b2d5152c4c1f
Reviewed-on: https://chromium-review.googlesource.com/1034463Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554744}

third_party/blink/renderer/modules/canvas/canvas2d/base_rendering_context_2d.cc

@@ -1889,7 +1889,7 @@ void BaseRenderingContext2D::InflateStrokeRect(FloatRect& rect) const {
   else if (GetState().GetLineCap() == kSquareCap)
     delta *= kRoot2;
 
-  rect.Inflate(delta);
+  rect.Inflate(clampTo<float>(delta));
 }
 
 bool BaseRenderingContext2D::imageSmoothingEnabled() const {