Implement link selection on alt+mouse drag.

third_party/WebKit/Source/web/tests/SelectionTestBase.h

Index: third_party/WebKit/Source/web/tests/SelectionTestBase.h
diff --git a/third_party/WebKit/Source/web/tests/SelectionTestBase.h b/third_party/WebKit/Source/web/tests/SelectionTestBase.h
new file mode 100644
index 0000000000000000000000000000000000000000..a3c5ff0543dbc84eb43d577ccd645ee358e15d30
--- /dev/null
+++ b/third_party/WebKit/Source/web/tests/SelectionTestBase.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2016 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.
+
+#ifndef SelectionTestBase_h
+#define SelectionTestBase_h
+
+#include "web/WebLocalFrameImpl.h"
+#include "web/tests/FrameTestHelpers.h"
+
+#include <gtest/gtest.h>
+#include <string>
+
+namespace blink {
+class IntPoint;
+class WebViewImpl;
+class WebLocalFrameImpl;
+
+class SelectionTestBase : public ::testing::Test {
+protected:
+    enum DragFlag {
+        SendDownEvent = 1,
+        SendUpEvent = 1 << 1
+    };
+    using DragFlags = unsigned;
+
+    void emulateMouseDrag(const IntPoint& downPoint, const IntPoint& upPoint, int modifiers,
+        DragFlags = SendDownEvent | SendUpEvent);

[kotenkov, 2016/03/10 12:00:30]

I've replaced bool parameters by flags. If it's not okay, would you please
suggest a better solution?

[yosin_UTC9, 2016/03/11 01:32:07]

Using flags seem to be OK.

Better solution is follow to window.eventSender model, == state machine, holding
mouse point.

class MockMouse {
 public:
  void moveTo(const IntPoint&);
  void buttonUp(MouseButton);
  void buttonDown(MouseButton);
 private:
  IntPoint m_point;
  int m_buttonStates; // each bit hold mouse button press/release state, bit
0=left, bit1=middle, bit3=right, bit4=and more..
};

void MockMouse::buttonUp(MouseButton button) {
  ASSERT((m_buttonState  & (1 << static_cast<int>(button>)) == 1);
  ... dispatch button up event
}

+
+    void emulateMouseClick(const IntPoint& clickPoint, WebMouseEvent::Button, int modifiers, int count = 1);
+    void emulateMouseDown(const IntPoint& clickPoint, WebMouseEvent::Button, int modifiers, int count = 1);
+
+    std::string getSelectionText();
+
+    FrameTestHelpers::WebViewHelper m_helper;
+    WebViewImpl* m_webView = nullptr;
+    RawPtrWillBePersistent<WebLocalFrameImpl> m_mainFrame = nullptr;
+};
+
+} // namespace blink
+
+#endif // SelectionTestBase_h