[DevTools] Switch from blink-based to content-based touch emulation.

Source/web/WebDevToolsAgentImpl.cpp

Index: Source/web/WebDevToolsAgentImpl.cpp
diff --git a/Source/web/WebDevToolsAgentImpl.cpp b/Source/web/WebDevToolsAgentImpl.cpp
index 9b08ec2e4bf8a02156ec17b0f7de55b018ffb3c4..727926eac4c294a6adce840882aa088bd856c210 100644
--- a/Source/web/WebDevToolsAgentImpl.cpp
+++ b/Source/web/WebDevToolsAgentImpl.cpp
@@ -51,6 +51,7 @@
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/inspector/InjectedScriptHost.h"
 #include "core/inspector/InspectorController.h"
 #include "core/page/Page.h"
@@ -205,6 +206,9 @@ WebDevToolsAgentImpl::WebDevToolsAgentImpl(
     , m_emulateViewportEnabled(false)
     , m_originalViewportEnabled(false)
     , m_isOverlayScrollbarsEnabled(false)
+    , m_touchEventEmulationEnabled(false)
+    , m_originalTouchEnabled(false)
+    , m_originalDeviceSupportsMouse(false)
 {
     ASSERT(m_hostId > 0);
     ClientMessageLoopAdapter::ensureClientMessageLoopCreated(m_client);
@@ -298,6 +302,23 @@ bool WebDevToolsAgentImpl::handleInputEvent(WebCore::Page* page, const WebInputE
     if (!m_attached && !m_generatingEvent)
         return false;
 
+    if (WebInputEvent::isGestureEventType(inputEvent.type) && m_touchEventEmulationEnabled) {
+        FrameView* frameView = page->mainFrame()->view();

[pfeldman, 2014/04/07 17:32:59]

Why are these gestures handled here?

[pfeldman, 2014/04/07 17:52:50]

Please add fixme and a link to a bug.

[dgozman, 2014/04/08 16:51:48]

Done.

+        PlatformGestureEventBuilder gestureEvent(frameView, *static_cast<const WebGestureEvent*>(&inputEvent));
+        if (gestureEvent.type() == PlatformEvent::GesturePinchUpdate) {
+            IntPoint offset = gestureEvent.position();
+            float oldPageScaleFactor = page->pageScaleFactor();
+            float newPageScaleFactor = oldPageScaleFactor * gestureEvent.scale();
+            float offsetScale = 1 - oldPageScaleFactor / newPageScaleFactor;
+            offset.scale(offsetScale, offsetScale);
+            m_webViewImpl->setPageScaleFactor(newPageScaleFactor, offset + frameView->scrollPosition());
+        }
+        if (gestureEvent.type() == PlatformEvent::GesturePinchBegin
+            || gestureEvent.type() == PlatformEvent::GesturePinchUpdate
+            || gestureEvent.type() == PlatformEvent::GesturePinchEnd)
+            return true;
+    }
+
     InspectorController* ic = inspectorController();
     if (!ic)
         return false;
@@ -352,6 +373,23 @@ void WebDevToolsAgentImpl::overrideDeviceMetrics(int width, int height, float de
     }
 }
 
+void WebDevToolsAgentImpl::setTouchEventEmulationEnabled(bool enabled)
+{
+    if (m_touchEventEmulationEnabled == enabled)
+        return;
+
+    if (!m_touchEventEmulationEnabled) {
+        m_originalTouchEnabled = RuntimeEnabledFeatures::touchEnabled();
+        if (m_webViewImpl->page())
+            m_originalDeviceSupportsMouse = m_webViewImpl->page()->settings().deviceSupportsMouse();
+    }
+    RuntimeEnabledFeatures::setTouchEnabled(enabled ? true : m_originalTouchEnabled);
+    if (m_webViewImpl->page())
+        m_webViewImpl->page()->settings().setDeviceSupportsMouse(enabled ? false : m_originalDeviceSupportsMouse);
+    m_client->setTouchEventEmulationEnabled(enabled);
+    m_touchEventEmulationEnabled = enabled;
+}
+
 void WebDevToolsAgentImpl::enableViewportEmulation()
 {
     if (m_emulateViewportEnabled)