[WK2] Navigation events not triggered by a mouse event claim to be triggered by the...

[WK2] Navigation events not triggered by a mouse event claim to be triggered by the left mouse button during policy decisions
https://bugs.webkit.org/show_bug.cgi?id=76344

Reviewed by Sam Weinig.

Source/WebKit2:

When creating InjectedBundleNavigationActions, initialize the mouse button to NoButton.
This ensures that when there is no mouse event associated with the action, when the event
hits the client-API layer, the button is still NoButton.

* WebProcess/InjectedBundle/InjectedBundleNavigationAction.cpp:
(WebKit::InjectedBundleNavigationAction::InjectedBundleNavigationAction): Initialize m_mouseButton
to WebMouseEvent::NoButton.

Tools:

Add a test verifying that the mouse button during policy decisions for
events not triggered by mouse events is NoButton.

* TestWebKitAPI/Tests/WebKit2/PageLoadBasic.cpp:
(TestWebKitAPI::decidePolicyForNavigationAction): Added test.
(TestWebKitAPI::decidePolicyForNewWindowAction): Added test.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105916 268f45cc-cd09-0410-ab3c-d52691b4dbfc