If the current wallpaper was set by a third party application, we should...

If the current wallpaper was set by a third party application, we should disable surprise me feature,
otherwise the wallpaper will still be changed periodically.

Also fix the issue that wallpaper picker application can't load the local resource:
chrome://resources/css/text_defaults.css.

BUG=466709
TEST=Manually tested

Review URL: https://codereview.chromium.org/1004263002

Cr-Commit-Position: refs/heads/master@{#320972}

chrome/browser/chromeos/extensions/wallpaper_api.cc

@@ -14,6 +14,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/threading/worker_pool.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/extensions/wallpaper_private_api.h"
 #include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_paths.h"
@@ -22,6 +23,7 @@
 #include "components/user_manager/user.h"
 #include "components/user_manager/user_manager.h"
 #include "components/wallpaper/wallpaper_layout.h"
+#include "extensions/browser/event_router.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
@@ -177,6 +179,18 @@ void WallpaperSetWallpaperFunction::OnWallpaperDecoded(
     }
     SendResponse(true);
   }
+
+  // Inform the native Wallpaper Picker Application that the current wallpaper
+  // has been modified by a third party application.
+  Profile* profile = Profile::FromBrowserContext(browser_context());
+  extensions::EventRouter* event_router = extensions::EventRouter::Get(profile);
+  scoped_ptr<base::ListValue> event_args(new base::ListValue());
+  scoped_ptr<extensions::Event> event(
+      new extensions::Event(extensions::api::wallpaper_private::
+                                OnWallpaperChangedBy3rdParty::kEventName,
+                            event_args.Pass()));
+  event_router->DispatchEventToExtension(extension_misc::kWallpaperManagerId,
+                                         event.Pass());
 }
 
 void WallpaperSetWallpaperFunction::GenerateThumbnail(

chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js

@@ -349,3 +349,9 @@ chrome.storage.onChanged.addListener(function(changes, namespace) {
 chrome.alarms.onAlarm.addListener(function() {
   SurpriseWallpaper.getInstance().next();
 });
+
+chrome.wallpaperPrivate.onWallpaperChangedBy3rdParty.addListener(function() {
+  WallpaperUtil.saveToStorage(Constants.AccessSurpriseMeEnabledKey,
+                              false, true);
+  SurpriseWallpaper.getInstance().disable();
+});

chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_images_grid.js

@@ -223,6 +223,10 @@ cr.define('wallpapers', function() {
       }
     },
 
+    get activeItem() {
+      return this.activeItem_;
+    },
+
     /**
      * A unique ID that assigned to each set dataModel operation. Note that this
      * id wont increase if the new dataModel is null or empty.

chrome/browser/resources/chromeos/wallpaper_manager/js/wallpaper_manager.js

@@ -203,12 +203,16 @@ function WallpaperManager(dialogDom) {
       if (chrome.runtime.lastError == null) {
           if (shouldEnable) {
             checkbox.classList.add('checked');
+            // Hides the wallpaper set by message if there is any.
+            $('wallpaper-set-by-message').textContent = '';
           } else {
             // Unchecking the "Surprise me" checkbox falls back to the previous
             // wallpaper before "Surprise me" was turned on.
-            self.setSelectedWallpaper_(self.wallpaperGrid_.activeItem_);
-            self.onWallpaperChanged_(self.wallpaperGrid_.activeItem_,
+            if (self.wallpaperGrid_.activeItem) {
+              self.setSelectedWallpaper_(self.wallpaperGrid_.activeItem);
+              self.onWallpaperChanged_(self.wallpaperGrid_.activeItem,
                                        self.currentWallpaper_);
+            }
             checkbox.classList.remove('checked');
           }
           $('categories-list').disabled = shouldEnable;

chrome/browser/resources/chromeos/wallpaper_manager/main.html

@@ -9,7 +9,7 @@ found in the LICENSE file.
 <head>
   <meta charset="utf-8">
   <title>Wallpaper Picker</title>
-  <link rel="stylesheet" href="chrome://resources/css/text_defaults.css">
+  <link rel="stylesheet" href="../../../../../ui/webui/resources/css/text_defaults.css">
   <link rel="stylesheet" href="../../../../../ui/webui/resources/css/widgets.css">
   <link rel="stylesheet" href="../../../../../ui/webui/resources/css/menu.css"></link>
 

chrome/common/extensions/api/wallpaper_private.json

@@ -256,6 +256,13 @@
           }
         ]
       }
+    ],
+    "events": [
+      {
+        "name": "onWallpaperChangedBy3rdParty",
+        "type": "function",
+        "description": "This event is sent when the current wallpaper was set by a third party application."
+      }
     ]
   }
 ]