Fix setPatternPhase to work with squashed layers.

The computation for setPatternPhase does not work if the NSView renders
into the CALayer of an ancestor of the NSView. Change the computation
to look up through the NSView hierarchy for a view that has a layer, and
compute the new phase using the coordinate system of that layer.

This is updating a fix that was originally made in r206004 to support
the squashed layers enabled in r247098.

BUG=245900

Review URL: https://codereview.chromium.org/148243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247326 0039d316-1c4b-4281-b951-d872f2087c98

ui/base/cocoa/nsgraphics_context_additions.mm

@@ -8,11 +8,14 @@ @implementation NSGraphicsContext (CrAdditions)
 
 - (void)cr_setPatternPhase:(NSPoint)phase
                    forView:(NSView*)view {
-  if ([view layer]) {
+  NSView* ancestorWithLayer = view;
+  while (ancestorWithLayer && ![ancestorWithLayer layer])
+    ancestorWithLayer = [ancestorWithLayer superview];
+  if (ancestorWithLayer) {
     NSPoint bottomLeft = NSZeroPoint;
-    if ([view isFlipped])
-      bottomLeft.y = NSMaxY([view bounds]);
-    NSPoint offset = [view convertPoint:bottomLeft toView:nil];
+    if ([ancestorWithLayer isFlipped])
+      bottomLeft.y = NSMaxY([ancestorWithLayer bounds]);
+    NSPoint offset = [ancestorWithLayer convertPoint:bottomLeft toView:nil];
     phase.x -= offset.x;
     phase.y -= offset.y;
   }