Return a enumeration of the state of handling of InputEvents.

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index c8c83ee97ed269bf35badb1874def1fbe770b4e6..46f9bc19f202d95031f3fa4b28d44e75e295cae1 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -316,14 +316,14 @@ void WebFrameWidgetImpl::themeChanged()
 
 const WebInputEvent* WebFrameWidgetImpl::m_currentInputEvent = nullptr;
 
-bool WebFrameWidgetImpl::handleInputEvent(const WebInputEvent& inputEvent)
+WebInputEventResult WebFrameWidgetImpl::handleInputEvent(const WebInputEvent& inputEvent)
 {
 
     TRACE_EVENT1("input", "WebFrameWidgetImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type));
 
     // Report the event to be NOT processed by WebKit, so that the browser can handle it appropriately.
     if (m_ignoreInputEvents)
-        return false;
+        return WebInputEventResult::NotHandled;
 
     // FIXME: pass event to m_localRoot's WebDevToolsAgentImpl once available.
 
@@ -364,7 +364,7 @@ bool WebFrameWidgetImpl::handleInputEvent(const WebInputEvent& inputEvent)
         node->dispatchMouseEvent(
             PlatformMouseEventBuilder(m_localRoot->frameView(), static_cast<const WebMouseEvent&>(inputEvent)),
             eventType, static_cast<const WebMouseEvent&>(inputEvent).clickCount);
-        return true;
+        return WebInputEventResult::HandledSystem;
     }
 
     return PageWidgetDelegate::handleInputEvent(*this, inputEvent, m_localRoot->frame());
@@ -704,14 +704,14 @@ void WebFrameWidgetImpl::handleMouseUp(LocalFrame& mainFrame, const WebMouseEven
     }
 }
 
-bool WebFrameWidgetImpl::handleMouseWheel(LocalFrame& mainFrame, const WebMouseWheelEvent& event)
+WebInputEventResult WebFrameWidgetImpl::handleMouseWheel(LocalFrame& mainFrame, const WebMouseWheelEvent& event)
 {
     return PageWidgetEventHandler::handleMouseWheel(mainFrame, event);
 }
 
-bool WebFrameWidgetImpl::handleGestureEvent(const WebGestureEvent& event)
+WebInputEventResult WebFrameWidgetImpl::handleGestureEvent(const WebGestureEvent& event)
 {
-    bool eventSwallowed = false;
+    WebInputEventResult eventResult = WebInputEventResult::NotHandled;
     bool eventCancelled = false;
     switch (event.type) {
     case WebInputEvent::GestureScrollBegin:
@@ -730,17 +730,17 @@ bool WebFrameWidgetImpl::handleGestureEvent(const WebGestureEvent& event)
     case WebInputEvent::GestureFlingStart:
     case WebInputEvent::GestureFlingCancel:
         m_client->didHandleGestureEvent(event, eventCancelled);
-        return false;
+        return WebInputEventResult::NotHandled;
     default:
         ASSERT_NOT_REACHED();
     }
     LocalFrame* frame = m_localRoot->frame();
-    eventSwallowed = frame->eventHandler().handleGestureEvent(PlatformGestureEventBuilder(frame->view(), event));
+    eventResult = frame->eventHandler().handleGestureEvent(PlatformGestureEventBuilder(frame->view(), event));
     m_client->didHandleGestureEvent(event, eventCancelled);
-    return eventSwallowed;
+    return eventResult;
 }
 
-bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
+WebInputEventResult WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
 {
     ASSERT((event.type == WebInputEvent::RawKeyDown)
         || (event.type == WebInputEvent::KeyDown)
@@ -758,17 +758,18 @@ bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
     if (focusedFrame && focusedFrame->isRemoteFrame()) {
         WebRemoteFrameImpl* webFrame = WebRemoteFrameImpl::fromFrame(*toRemoteFrame(focusedFrame.get()));
         webFrame->client()->forwardInputEvent(&event);
-        return true;
+        return WebInputEventResult::HandledSystem;
     }
 
     if (!focusedFrame || !focusedFrame->isLocalFrame())
-        return false;
+        return WebInputEventResult::NotHandled;
 
     RefPtrWillBeRawPtr<LocalFrame> frame = toLocalFrame(focusedFrame.get());
 
     PlatformKeyboardEventBuilder evt(event);
 
-    if (frame->eventHandler().keyEvent(evt)) {
+    WebInputEventResult result = frame->eventHandler().keyEvent(evt);
+    if (result != WebInputEventResult::NotHandled) {
         if (WebInputEvent::RawKeyDown == event.type) {
             // Suppress the next keypress event unless the focused node is a plugin node.
             // (Flash needs these keypress events to handle non-US keyboards.)
@@ -776,7 +777,7 @@ bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
             if (!element || !element->layoutObject() || !element->layoutObject()->isEmbeddedObject())
                 m_suppressNextKeypressEvent = true;
         }
-        return true;
+        return result;
     }
 
 #if !OS(MACOSX)
@@ -791,14 +792,14 @@ bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
     bool isShiftF10 = event.modifiers == WebInputEvent::ShiftKey && event.windowsKeyCode == VKEY_F10;
     if ((isUnmodifiedMenuKey || isShiftF10) && event.type == contextMenuTriggeringEventType) {
         view()->sendContextMenuEvent(event);
-        return true;
+        return WebInputEventResult::HandledSystem;
     }
 #endif // !OS(MACOSX)
 
     return keyEventDefault(event);
 }
 
-bool WebFrameWidgetImpl::handleCharEvent(const WebKeyboardEvent& event)
+WebInputEventResult WebFrameWidgetImpl::handleCharEvent(const WebKeyboardEvent& event)
 {
     ASSERT(event.type == WebInputEvent::Char);
 
@@ -812,37 +813,42 @@ bool WebFrameWidgetImpl::handleCharEvent(const WebKeyboardEvent& event)
 
     LocalFrame* frame = toLocalFrame(focusedCoreFrame());
     if (!frame)
-        return suppress;
+        return suppress ? WebInputEventResult::HandledSuppressed : WebInputEventResult::NotHandled;
 
     EventHandler& handler = frame->eventHandler();
 
     PlatformKeyboardEventBuilder evt(event);
     if (!evt.isCharacterKey())
-        return true;
+        return WebInputEventResult::HandledSuppressed;
 
     // Accesskeys are triggered by char events and can't be suppressed.
+    // It is unclear whether a keypress should be dispatched as well
+    // crbug.com/563507
     if (handler.handleAccessKey(evt))
-        return true;
+        return WebInputEventResult::HandledSystem;
 
     // Safari 3.1 does not pass off windows system key messages (WM_SYSCHAR) to
     // the eventHandler::keyEvent. We mimic this behavior on all platforms since
     // for now we are converting other platform's key events to windows key
     // events.
     if (evt.isSystemKey())
-        return false;
+        return WebInputEventResult::NotHandled;
 
-    if (!suppress && !handler.keyEvent(evt))
-        return keyEventDefault(event);
+    if (suppress)
+        return WebInputEventResult::HandledSuppressed;
 
-    return true;
-}
+    WebInputEventResult result = handler.keyEvent(evt);
+    if (result != WebInputEventResult::NotHandled)
+        return result;
 
+    return keyEventDefault(event);
+}
 
-bool WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
+WebInputEventResult WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
 {
     LocalFrame* frame = toLocalFrame(focusedCoreFrame());
     if (!frame)
-        return false;
+        return WebInputEventResult::NotHandled;
 
     switch (event.type) {
     case WebInputEvent::Char:
@@ -857,11 +863,11 @@ bool WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
 #if !OS(MACOSX)
             case 'A':
                 WebFrame::fromFrame(focusedCoreFrame())->executeCommand(WebString::fromUTF8("SelectAll"));
-                return true;
+                return WebInputEventResult::HandledSystem;
             case VKEY_INSERT:
             case 'C':
                 WebFrame::fromFrame(focusedCoreFrame())->executeCommand(WebString::fromUTF8("Copy"));
-                return true;
+                return WebInputEventResult::HandledSystem;
 #endif
             // Match FF behavior in the sense that Ctrl+home/end are the only Ctrl
             // key combinations which affect scrolling. Safari is buggy in the
@@ -871,7 +877,7 @@ bool WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
             case VKEY_END:
                 break;
             default:
-                return false;
+                return WebInputEventResult::NotHandled;
             }
         }
         if (!event.isSystemKey && !(event.modifiers & WebInputEvent::ShiftKey))
@@ -880,10 +886,10 @@ bool WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
     default:
         break;
     }
-    return false;
+    return WebInputEventResult::NotHandled;
 }
 
-bool WebFrameWidgetImpl::scrollViewWithKeyboard(int keyCode, int modifiers)
+WebInputEventResult WebFrameWidgetImpl::scrollViewWithKeyboard(int keyCode, int modifiers)
 {
     ScrollDirection scrollDirection;
     ScrollGranularity scrollGranularity;
@@ -897,11 +903,12 @@ bool WebFrameWidgetImpl::scrollViewWithKeyboard(int keyCode, int modifiers)
     }
 #endif
     if (!mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity))
-        return false;
+        return WebInputEventResult::NotHandled;
 
-    if (LocalFrame* frame = toLocalFrame(focusedCoreFrame()))
-        return frame->eventHandler().bubblingScroll(scrollDirection, scrollGranularity);
-    return false;
+    LocalFrame* frame = toLocalFrame(focusedCoreFrame());
+    if (frame && frame->eventHandler().bubblingScroll(scrollDirection, scrollGranularity))
+        return WebInputEventResult::HandledSystem;
+    return WebInputEventResult::NotHandled;
 }
 
 bool WebFrameWidgetImpl::mapKeyCodeForScroll(