[MD History] Hide empty synced device cards.

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 6457 matching lines @@
   lastFocus_: null,
   attached: function() {
     window.addEventListener('resize', this.closeMenu.bind(this));
   },
   closeMenu: function() {
     if (this.root.activeElement == null) {
       this.$.dropdown.restoreFocusOnClose = false;
     }
     this.menuOpen = false;
   },
-  openMenu: function(anchor, itemData) {
+  openMenu: function(anchor, opt_itemData) {
     if (this.lastAnchor_ == anchor && this.menuOpen) return;
     if (this.menuOpen) this.closeMenu();
-    this.itemData = itemData;
+    this.itemData = opt_itemData || null;
     this.lastAnchor_ = anchor;
     this.$.dropdown.restoreFocusOnClose = true;
     var focusableChildren = Polymer.dom(this).querySelectorAll('[tabindex]:not([disabled]):not([hidden]),' + 'button:not([disabled]):not([hidden])');
     if (focusableChildren.length > 0) {
       this.$.dropdown.focusTarget = focusableChildren[0];
       this.firstFocus_ = focusableChildren[0];
       this.lastFocus_ = focusableChildren[focusableChildren.length - 1];
     }
     this.$.dropdown.positionTarget = anchor;
     this.menuOpen = true;
   },
-  toggleMenu: function(anchor, itemData) {
-    if (anchor == this.lastAnchor_ && this.menuOpen) this.closeMenu(); else this.openMenu(anchor, itemData);
+  toggleMenu: function(anchor, opt_itemData) {
+    if (anchor == this.lastAnchor_ && this.menuOpen) this.closeMenu(); else this.openMenu(anchor, opt_itemData);
   },
   onTabPressed_: function(e) {
     if (!this.firstFocus_ || !this.lastFocus_) return;
     var toFocus;
     var keyEvent = e.detail.keyboardEvent;
     if (keyEvent.shiftKey && keyEvent.target == this.firstFocus_) toFocus = this.lastFocus_; else if (!keyEvent.shiftKey && keyEvent.target == this.lastFocus_) toFocus = this.firstFocus_;
     if (!toFocus) return;
     e.preventDefault();
     toFocus.focus();
   },
@@ skipping 2131 matching lines @@
     if (guestSession) return true;
     return signInState && syncedDevicesLength == 0;
   },
   showSignInGuide: function(signInState, guestSession) {
     var show = !signInState && !guestSession;
     if (show) {
       md_history.BrowserService.getInstance().recordAction('Signin_Impression_FromRecentTabs');
     }
     return show;
   },
-  noSyncedTabsMessage: function(fetchingSyncedTabs) {
-    return loadTimeData.getString(fetchingSyncedTabs ? 'loading' : 'noSyncedResults');
+  noSyncedTabsMessage: function() {
+    var stringName = this.fetchingSyncedTabs_ ? 'loading' : 'noSyncedResults';
+    if (this.searchTerm !== '') stringName = 'noSearchResults';
+    return loadTimeData.getString(stringName);
   },
   updateSyncedDevices: function(sessionList) {
     this.fetchingSyncedTabs_ = false;
     if (!sessionList) return;
     if (sessionList.length > 0 && !this.hasSeenForeignData_) {
       this.hasSeenForeignData_ = true;
       md_history.BrowserService.getInstance().recordHistogram(SYNCED_TABS_HISTOGRAM_NAME, SyncedTabsHistogram.HAS_FOREIGN_DATA, SyncedTabsHistogram.LIMIT);
     }
     var updateCount = Math.min(sessionList.length, this.syncedDevices_.length);
     for (var i = 0; i < updateCount; i++) {
       var oldDevice = this.syncedDevices_[i];
       if (oldDevice.tag != sessionList[i].tag || oldDevice.timestamp != sessionList[i].timestamp) {
-        this.splice('syncedDevices_', i, 1, this.createInternalDevice_(sessionList[i]));
+        device = this.createInternalDevice_(sessionList[i]);
+        if (device.tabs.length != 0) this.splice('syncedDevices_', i, 1, device);
       }
     }
     if (sessionList.length >= this.syncedDevices_.length) {
       for (var i = updateCount; i < sessionList.length; i++) {
-        this.push('syncedDevices_', this.createInternalDevice_(sessionList[i]));
+        device = this.createInternalDevice_(sessionList[i]);
+        if (device.tabs.length != 0) this.push('syncedDevices_', device);
       }
     } else {
       this.splice('syncedDevices_', updateCount, this.syncedDevices_.length - updateCount);
     }
   },
   tabSyncDisabled: function() {
     this.fetchingSyncedTabs_ = false;
     this.clearDisplayedSyncedDevices_();
   },
   signInStateChanged_: function() {
@@ skipping 264 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });