[DevTools] When adjusting glass pane's content width for arrow, do not comporomise the size

third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js

Index: third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js b/third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js
index 831020febb1ea1fd6b2f977786e205be74dfe925..abba679e1b700a8945dfe4e3cb0400e9f321f1f3 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/GlassPane.js
@@ -240,7 +240,7 @@ UI.GlassPane = class {
 
         positionX = Math.max(gutterSize, Math.min(anchorBox.x, containerWidth - width - gutterSize));
         if (!enoughHeight)
-          positionX += arrowSize;
+          positionX = Math.min(positionX + arrowSize, containerWidth - width - gutterSize);
         else if (showArrow && positionX - arrowSize >= gutterSize)
           positionX -= arrowSize;
         width = Math.min(width, containerWidth - positionX - gutterSize);
@@ -298,7 +298,7 @@ UI.GlassPane = class {
 
         positionY = Math.max(gutterSize, Math.min(anchorBox.y, containerHeight - height - gutterSize));
         if (!enoughWidth)
-          positionY += arrowSize;
+          positionY = Math.min(positionY + arrowSize, containerHeight - height - gutterSize);
         else if (showArrow && positionY - arrowSize >= gutterSize)
           positionY -= arrowSize;
         height = Math.min(height, containerHeight - positionY - gutterSize);