Add test_runner hook to dump drag image.

content/shell/renderer/test_runner/web_test_proxy.cc

 // 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.
 
 #include "content/shell/renderer/test_runner/web_test_proxy.h"
 
 #include <cctype>
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 547 matching lines @@
   canvas.drawBitmap(bitmap, popup_position_.x(), popup_position_.y());
   callback_.Run(main_bitmap_);
   delete this;
 }
 
 void WebTestProxyBase::CapturePixelsAsync(
     const base::Callback<void(const SkBitmap&)>& callback) {
   TRACE_EVENT0("shell", "WebTestProxyBase::CapturePixelsAsync");
   DCHECK(!callback.is_null());
 
+  if (!drag_image_.isNull()) {
+    callback.Run(drag_image_.getSkBitmap());
+    return;
+  }
+
   if (test_interfaces_->GetTestRunner()->isPrinting()) {
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE,
         base::Bind(&WebTestProxyBase::CapturePixelsForPrinting,
                    base::Unretained(this),
                    callback));
     return;
   }
 
   CaptureCallback* capture_callback = new CaptureCallback(base::Bind(
@@ skipping 221 matching lines @@
 
     delegate_->PrintMessage(message + "\n");
   }
 }
 
 void WebTestProxyBase::StartDragging(blink::WebLocalFrame* frame,
                                      const blink::WebDragData& data,
                                      blink::WebDragOperationsMask mask,
                                      const blink::WebImage& image,
                                      const blink::WebPoint& point) {
+  if (test_interfaces_->GetTestRunner()->shouldDumpDragImage()) {
+    if (drag_image_.isNull())
+      drag_image_ = image;
+  }
   // When running a test, we need to fake a drag drop operation otherwise
   // Windows waits for real mouse events to know when the drag is over.
   test_interfaces_->GetEventSender()->DoDragDrop(data, mask);
 }
 
 // The output from these methods in layout test mode should match that
 // expected by the layout tests. See EditingDelegate.m in DumpRenderTree.
 
 void WebTestProxyBase::DidChangeSelection(bool is_empty_callback) {
   if (test_interfaces_->GetTestRunner()->shouldDumpEditingCallbacks())
@@ skipping 494 matching lines @@
   // to cancel the input method's ongoing composition session.
   if (web_widget_)
     web_widget_->confirmComposition();
 }
 
 blink::WebString WebTestProxyBase::acceptLanguages() {
   return blink::WebString::fromUTF8(accept_languages_);
 }
 
 }  // namespace content