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

chrome/browser/ui/cocoa/toolbar/toolbar_view.mm

Index: chrome/browser/ui/cocoa/toolbar/toolbar_view.mm
diff --git a/chrome/browser/ui/cocoa/toolbar/toolbar_view.mm b/chrome/browser/ui/cocoa/toolbar/toolbar_view.mm
index 5b9cb46831e8baea4b751f733287f34ec6fcc715..a4ec3fd40461a17c4f553023e17e55a74aa3d009 100644
--- a/chrome/browser/ui/cocoa/toolbar/toolbar_view.mm
+++ b/chrome/browser/ui/cocoa/toolbar/toolbar_view.mm
@@ -18,9 +18,8 @@
 }
 
 - (void)drawRect:(NSRect)rect {
-  // The toolbar's background pattern is phased relative to the
-  // tab strip view's background pattern.
-  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];
 }