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

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
index 096e376e804c368fedad8da270b1fc96a919e955..3a7cef4f69c9900f5119438f702ab46415997656 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
@@ -46,7 +46,8 @@ const CGFloat kBorderRadius = 3.0;
       [controller_ isAnimatingFromState:BookmarkBar::DETACHED]) {
     [self drawAsDetachedBubble];
   } else {
-    NSPoint phase = [[self window] themePatternPhase];
+    NSPoint phase = [[self window]
+        themePatternPhaseForAlignment:THEME_PATTERN_ALIGN_WITH_TAB_STRIP];
     [[NSGraphicsContext currentContext] cr_setPatternPhase:phase forView:self];
     [self drawBackgroundWithOpaque:YES];
   }
@@ -76,7 +77,9 @@ const CGFloat kBorderRadius = 3.0;
     CGContextRef cgContext = static_cast<CGContextRef>([context graphicsPort]);
     CGContextSetAlpha(cgContext, 1 - morph);
     CGContextBeginTransparencyLayer(cgContext, NULL);
-    [context cr_setPatternPhase:[[self window] themePatternPhase] forView:self];
+    NSPoint phase = [[self window]
+        themePatternPhaseForAlignment:THEME_PATTERN_ALIGN_WITH_TAB_STRIP];
+    [context cr_setPatternPhase:phase forView:self];
     [self drawBackgroundWithOpaque:YES];
     CGContextEndTransparencyLayer(cgContext);
   }