Add browser test to the sharing dialog feature in Files.app.

chrome/browser/resources/file_manager/js/share_dialog.js

Index: chrome/browser/resources/file_manager/js/share_dialog.js
diff --git a/chrome/browser/resources/file_manager/js/share_dialog.js b/chrome/browser/resources/file_manager/js/share_dialog.js
index 15ba6c8c80f16178662d8a81878982540def4e48..6cbf3d341f6bb4f5231714f0666c2f3f075d18a4 100644
--- a/chrome/browser/resources/file_manager/js/share_dialog.js
+++ b/chrome/browser/resources/file_manager/js/share_dialog.js
@@ -56,9 +56,11 @@ ShareDialog.WebViewAuthorizer.prototype.initialize = function(callback) {
 
   var registerInjectionHooks = function() {
     this.webView_.removeEventListener('loadstop', registerInjectionHooks);
+    var pattern = (this.origin_ == '<all_urls>') ? this.origin_ :
+                                                   this.origin_ + '/*';
     this.webView_.onBeforeSendHeaders.addListener(
       this.authorizeRequest_.bind(this),
-      {urls: [this.origin_ + '/*']},
+      {urls: [pattern]},
       ['blocking', 'requestHeaders']);
     this.initialized_ = true;
     callback();
@@ -218,14 +220,14 @@ ShareDialog.prototype.show = function(entry, onFailure) {
         this.webViewWrapper_, 'share-dialog-webview', 'webview');
     this.webView_.setAttribute('tabIndex', '-1');
     this.webViewAuthorizer_ = new ShareDialog.WebViewAuthorizer(
-        ShareClient.SHARE_TARGET, this.webView_);
+        !window.IN_TEST ? ShareClient.SHARE_TARGET : '<all_urls>',
+        this.webView_);
     this.webView_.addEventListener('newwindow', function(e) {
       // Discard the window object and reopen in an external window.
       e.window.discard();
       chrome.windows.create({url: e.targetUrl});
       e.preventDefault();
     });
-
     cr.ui.dialogs.BaseDialog.prototype.show.call(this, '', null, null, null);
 
     // Initialize and authorize the Web View tag asynchronously.