ntp: add tooltips for all tile types

chrome/browser/resources/ntp4/apps_page.js

Index: chrome/browser/resources/ntp4/apps_page.js
diff --git a/chrome/browser/resources/ntp4/apps_page.js b/chrome/browser/resources/ntp4/apps_page.js
index bc98db8ce4b5626454216947eec8c2acb2b0c7f1..04f9c270e84417c87d934de4424fa0b63df80a31 100644
--- a/chrome/browser/resources/ntp4/apps_page.js
+++ b/chrome/browser/resources/ntp4/apps_page.js
@@ -198,6 +198,7 @@ cr.define('ntp4', function() {
         imgDiv.className = 'app-icon-div';
         imgDiv.appendChild(appImgContainer);
         imgDiv.addEventListener('click', this.onClick_.bind(this));
+        imgDiv.title = this.appData_.name;
         this.imgDiv_ = imgDiv;
         appContents.appendChild(imgDiv);
         this.appImgContainer_.style.position = 'absolute';
@@ -210,11 +211,12 @@ cr.define('ntp4', function() {
         chrome.send('getAppIconDominantColor', [this.id]);
       } else {
         appImgContainer.addEventListener('click', this.onClick_.bind(this));
+        appImgContainer.title = this.appData_.name;
         appContents.appendChild(appImgContainer);
       }
 
       var appSpan = this.ownerDocument.createElement('span');
-      appSpan.textContent = this.appData_.name;
+      appSpan.textContent = appSpan.title = this.appData_.name;
       appSpan.addEventListener('click', this.onClick_.bind(this));
       appContents.appendChild(appSpan);
       this.appendChild(appContents);