Implement webview.captureVisibleRegion()

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

Index: extensions/test/data/web_view/apitest/main.js
diff --git a/extensions/test/data/web_view/apitest/main.js b/extensions/test/data/web_view/apitest/main.js
index 983212cc0910060ed74a200278aba3129f50e490..4eda2138c3a467abbb9e12bdb25dc6dba247b88b 100644
--- a/extensions/test/data/web_view/apitest/main.js
+++ b/extensions/test/data/web_view/apitest/main.js
@@ -1685,6 +1685,28 @@ function testWebRequestAPIGoogleProperty() {
   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.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 {
+        embedder.test.assertTrue(
+            imgdata.indexOf('data:image/jpeg;base64') == 0);
+        embedder.test.succeed();
+      }
+    });
+  });
+  document.body.appendChild(webview);
+}
+
 // Tests end.
 
 embedder.test.testList = {
@@ -1752,7 +1774,8 @@ embedder.test.testList = {
   'testWebRequestAPI': testWebRequestAPI,
   'testWebRequestAPIWithHeaders': testWebRequestAPIWithHeaders,
   'testWebRequestAPIExistence': testWebRequestAPIExistence,
-  'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty
+  'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty,
+  'testCaptureVisibleRegion' : testCaptureVisibleRegion
 };
 
 onload = function() {