Bug 799333: Make reflow-on-zoom reset after a double-tap to zoom out. [r=blassey]

mobile/android/chrome/content/browser.js

@@ -3584,6 +3584,13 @@ var BrowserEventHandler = {
     this.updateReflozPref();
   },
 
+  resetMaxLineBoxWidth: function() {
+    let webNav = window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIWebNavigation);
+    let docShell = webNav.QueryInterface(Ci.nsIDocShell);
+    let docViewer = docShell.contentViewer.QueryInterface(Ci.nsIMarkupDocumentViewer);
+    docViewer.changeMaxLineBoxWidth(0);
+  },
+
   updateReflozPref: function() {
      this.mReflozPref = Services.prefs.getBoolPref("browser.zoom.reflowOnZoom");
   },
@@ -3747,6 +3754,7 @@ var BrowserEventHandler = {
   },
 
   _zoomOut: function() {
+    BrowserEventHandler.resetMaxLineBoxWidth();
     sendMessageToJava({ gecko: { type: "Browser:ZoomToPageWidth"} });
   },
 
@@ -3839,6 +3847,10 @@ var BrowserEventHandler = {
       }
     }
 
+    if (rect.w > viewport.cssWidth || rect.h > viewport.cssHeight) {
+      BrowserEventHandler.resetMaxLineBoxWidth();
+    }
+
     sendMessageToJava({ gecko: rect });
   },