Refactor themePatternPhase and tab_view in preparation for fixing crbug.com/176857

chrome/browser/ui/cocoa/find_bar/find_bar_view.mm

Index: chrome/browser/ui/cocoa/find_bar/find_bar_view.mm
diff --git a/chrome/browser/ui/cocoa/find_bar/find_bar_view.mm b/chrome/browser/ui/cocoa/find_bar/find_bar_view.mm
index eb7e9d50e7c62d1b1a8a1d50139c6e42af6e383a..266804616e8e986ebcd45fb2857bce9dfd18475b 100644
--- a/chrome/browser/ui/cocoa/find_bar/find_bar_view.mm
+++ b/chrome/browser/ui/cocoa/find_bar/find_bar_view.mm
@@ -70,7 +70,8 @@ CGFloat kCurveSize = 8;
     [path addClip];
 
     // Set the pattern phase
-    NSPoint phase = [[self window] themePatternPhase];
+    NSPoint phase = [[self window]
+        themePatternPhaseForAlignment:THEME_PATTERN_ALIGN_WITH_TAB_STRIP];
 
     [context cr_setPatternPhase:phase forView:self];
     [super drawBackgroundWithOpaque:YES];