Bug 1334642 - Cache luminance values for each toolbar in ToolbarIconColor. r=dao,mconley

* Track window states: active, fullscreen and tabsintitlebar for each window
* Use toolbar.id and window state to store and retrieve values from cache
* Note: As each window has its own ToolbarIconColor object, the cache is not currently shared across windows
* inferFromText callers pass in a reason and associated value, which is used to update the state we track, and potentially clear out the cache
* Create new windows test directory for browser-window-specific tests like this
* Test for the ToolbarIconColor changes to avoid sync style flushes when windows activate/deactivate
* Skip test for windows 8, follow-up filed as bug 1356684

MozReview-Commit-ID: JDJ3RtL4Lge

browser/base/content/browser-fullScreenAndPointerLock.js

@@ -636,7 +636,8 @@ var FullScreen = {
       }
     }
 
-    ToolbarIconColor.inferFromText();
+    ToolbarIconColor.inferFromText("fullscreen", aEnterFS);
+
 
     // For Lion fullscreen, all fullscreen controls are hidden, don't
     // bother to touch them. If we don't stop here, the following code