Fix autoscrolling

We were missing the connection between on begin frame and progressing
auto-scroll.

Change-Id: I651b35c031afedc9aeef1dc6a16547757b869633
Fixes: QTBUG-71370
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

4 files changed, 17 insertions, 6 deletions

diff --git a/src/core/compositor.cpp b/src/core/compositor.cpp
index 5dd053718..f7a5e651c 100644
--- a/src/core/compositor.cpp
+++ b/src/core/compositor.cpp
@@ -40,15 +40,17 @@
 #include "compositor.h"
 
 #include "delegated_frame_node.h"
+#include "render_widget_host_view_qt.h"
 
-#include <components/viz/common/resources/returned_resource.h>
-#include <content/public/browser/browser_thread.h>
-#include <services/viz/public/interfaces/compositing/compositor_frame_sink.mojom.h>
+#include "components/viz/common/resources/returned_resource.h"
+#include "content/public/browser/browser_thread.h"
+#include "services/viz/public/interfaces/compositing/compositor_frame_sink.mojom.h"
 
 namespace QtWebEngineCore {
 
-Compositor::Compositor()
+Compositor::Compositor(RenderWidgetHostViewQt *hostView)
     : m_chromiumCompositorData(new ChromiumCompositorData)
+    , m_view(hostView)
 {
     DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
@@ -163,6 +165,7 @@ bool Compositor::OnBeginFrameDerivedImpl(const viz::BeginFrameArgs &args)
 {
     DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
+    m_view->OnBeginFrame(args.frame_time);
     m_beginFrameSource->OnUpdateVSyncParameters(args.frame_time, args.interval);
     if (m_frameSinkClient)
         m_frameSinkClient->OnBeginFrame(args);
diff --git a/src/core/compositor.h b/src/core/compositor.h
index 4852d0590..7d7db5d04 100644
--- a/src/core/compositor.h
+++ b/src/core/compositor.h
@@ -60,6 +60,7 @@ class CompositorFrameSinkClient;
 
 namespace QtWebEngineCore {
 
+class RenderWidgetHostViewQt;
 class RenderWidgetHostViewQtDelegate;
 class ChromiumCompositorData;
 
@@ -84,7 +85,7 @@ class ChromiumCompositorData;
 class Compositor final : private viz::BeginFrameObserverBase
 {
 public:
-    explicit Compositor();
+    explicit Compositor(RenderWidgetHostViewQt *hostView);
     ~Compositor() override;
 
     void setViewDelegate(RenderWidgetHostViewQtDelegate *viewDelegate);
@@ -105,6 +106,7 @@ private:
 
     std::vector<viz::ReturnedResource> m_resourcesToRelease;
     QExplicitlySharedDataPointer<ChromiumCompositorData> m_chromiumCompositorData;
+    RenderWidgetHostViewQt *m_view;
     RenderWidgetHostViewQtDelegate *m_viewDelegate = nullptr;
     std::unique_ptr<viz::SyntheticBeginFrameSource> m_beginFrameSource;
     viz::mojom::CompositorFrameSinkClient *m_frameSinkClient = nullptr;
diff --git a/src/core/render_widget_host_view_qt.cpp b/src/core/render_widget_host_view_qt.cpp
index 9706ac070..4ed62504f 100644
--- a/src/core/render_widget_host_view_qt.cpp
+++ b/src/core/render_widget_host_view_qt.cpp
@@ -260,7 +260,7 @@ RenderWidgetHostViewQt::RenderWidgetHostViewQt(content::RenderWidgetHost *widget
     , m_gestureProvider(QtGestureProviderConfig(), this)
     , m_sendMotionActionDown(false)
     , m_touchMotionStarted(false)
-    , m_compositor(new Compositor)
+    , m_compositor(new Compositor(this))
     , m_loadVisuallyCommittedState(NotCommitted)
     , m_adapterClient(0)
     , m_imeInProgress(false)
@@ -1637,6 +1637,11 @@ void RenderWidgetHostViewQt::SetNeedsBeginFrames(bool needs_begin_frames)
     m_compositor->setNeedsBeginFrames(needs_begin_frames);
 }
 
+void RenderWidgetHostViewQt::OnBeginFrame(base::TimeTicks frame_time)
+{
+    host()->ProgressFlingIfNeeded(frame_time);
+}
+
 content::RenderFrameHost *RenderWidgetHostViewQt::getFocusedFrameHost()
 {
     content::RenderViewHostImpl *viewHost = content::RenderViewHostImpl::From(host());
diff --git a/src/core/render_widget_host_view_qt.h b/src/core/render_widget_host_view_qt.h
index 8db3351f4..6dd4d57e5 100644
--- a/src/core/render_widget_host_view_qt.h
+++ b/src/core/render_widget_host_view_qt.h
@@ -112,6 +112,7 @@ public:
     RenderWidgetHostViewQtDelegate *delegate() { return m_delegate.get(); }
     void setDelegate(RenderWidgetHostViewQtDelegate *delegate);
     void setAdapterClient(WebContentsAdapterClient *adapterClient);
+    void OnBeginFrame(base::TimeTicks frame_time);
 
     void InitAsChild(gfx::NativeView) override;
     void InitAsPopup(content::RenderWidgetHostView*, const gfx::Rect&) override;