Add line height setting to views::Label & use it for notifications.

ui/views/view_text_utils.cc

Index: ui/views/view_text_utils.cc
diff --git a/ui/views/view_text_utils.cc b/ui/views/view_text_utils.cc
index 0ea27d7624d9c35c09ab5a3af10e7197caa12e98..18cc40dbebd80d321bf731d4b2b544a58f3b28f0 100644
--- a/ui/views/view_text_utils.cc
+++ b/ui/views/view_text_utils.cc
@@ -111,7 +111,7 @@ void DrawTextStartingFrom(gfx::Canvas* canvas,
       word = text;  // Draw the whole text at once.
 
     int w = 0, h = 0;
-    gfx::Canvas::SizeStringInt(word, font, &w, &h, flags);
+    gfx::Canvas::SizeStringInt(word, font, &w, &h, 0, flags);
 
     // If we exceed the boundaries, we need to wrap.
     WrapIfWordDoesntFit(w, font.GetHeight(), position, bounds);