Implement webview.captureVisibleRegion()

extensions/test/data/web_view/apitest/main.js

 // Copyright 2014 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.
 
 var embedder = {};
 
 // TODO(lfg) Move these functions to a common js.
 embedder.setUp_ = function(config) {
   if (!config || !config.testServer) {
     return;
@@ skipping 1667 matching lines @@
 function testWebRequestAPIGoogleProperty() {
   var webview = new WebView();
   webview.request.onBeforeRequest.addListener(function(e) {
     embedder.test.succeed();
     return {cancel: true};
   }, { urls: ['<all_urls>']}, ['blocking']) ;
   webview.src = 'http://clients6.google.com';
   document.body.appendChild(webview);
 }
 
+// This is a basic test to verify that image data is returned by
+// captureVisibleRegion().
+function testCaptureVisibleRegion() {
+  var webview = document.createElement('webview');
+  webview.setAttribute('src', 'data:text/html,webview test');
+
+  webview.addEventListener('loadstop', function(e) {
+    webview.captureVisibleRegion(
+        {},
+        function(imgdata) {
+          if (chrome.runtime.lastError) {
+            console.log(
+                'webview.apitest.testCaptureVisibleRegion: ' +
+                chrome.runtime.lastError.message);
+            embedder.test.fail();
+          } else {
+            if (imgdata.indexOf('data:image/jpeg;base64') != 0) {
+              console_log('imgdata = ' + imgdata);
+            }
+            embedder.test.assertTrue(
+                imgdata.indexOf('data:image/jpeg;base64') == 0);
+            embedder.test.succeed();
+          }
+        });
+  });
+  document.body.appendChild(webview);
+}
+
+function captureVisibleRegionDoCapture() {}
+
 // Tests end.
 
 embedder.test.testList = {
   'testAllowTransparencyAttribute': testAllowTransparencyAttribute,
   'testAPIMethodExistence': testAPIMethodExistence,
   'testAssignSrcAfterCrash': testAssignSrcAfterCrash,
   'testAutosizeAfterNavigation': testAutosizeAfterNavigation,
   'testAutosizeBeforeNavigation': testAutosizeBeforeNavigation,
   'testAutosizeHeight': testAutosizeHeight,
   'testAutosizeRemoveAttributes': testAutosizeRemoveAttributes,
@@ skipping 47 matching lines @@
   'testReload': testReload,
   'testReloadAfterTerminate': testReloadAfterTerminate,
   'testRemoveSrcAttribute': testRemoveSrcAttribute,
   'testRemoveWebviewAfterNavigation': testRemoveWebviewAfterNavigation,
   'testRemoveWebviewOnExit': testRemoveWebviewOnExit,
   'testResizeWebviewResizesContent': testResizeWebviewResizesContent,
   'testTerminateAfterExit': testTerminateAfterExit,
   'testWebRequestAPI': testWebRequestAPI,
   'testWebRequestAPIWithHeaders': testWebRequestAPIWithHeaders,
   'testWebRequestAPIExistence': testWebRequestAPIExistence,
-  'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty
+  'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty,
+  'testCaptureVisibleRegion': testCaptureVisibleRegion
 };
 
 onload = function() {
   chrome.test.getConfig(function(config) {
     embedder.setUp_(config);
     chrome.test.sendMessage('LAUNCHED');
   });
 };