Bug 1583956 - Add additional APZ logging. r=botond

Depends on D64461

Differential Revision: https://phabricator.services.mozilla.com/D64462

--HG--
extra : moz-landing-system : lando

gfx/layers/apz/src/AsyncPanZoomController.cpp

@@ -2786,6 +2786,7 @@ nsEventStatus AsyncPanZoomController::GenerateSingleTap(
       // the corresponding touch-up. To avoid that we schedule the singletap
       // message to run on the next spin of the event loop. See bug 965381 for
       // the issue this was causing.
+      APZC_LOG("posting runnable for HandleTap from GenerateSingleTap");
       RefPtr<Runnable> runnable =
           NewRunnableMethod<TapType, LayoutDevicePoint, mozilla::Modifiers,
                             ScrollableLayerGuid, uint64_t>(

gfx/layers/apz/util/ChromeProcessController.cpp

@@ -21,6 +21,8 @@
 #include "nsLayoutUtils.h"
 #include "nsView.h"
 
+static mozilla::LazyLogModule sApzChromeLog("apz.cc.chrome");
+
 using namespace mozilla;
 using namespace mozilla::layers;
 using namespace mozilla::widget;
@@ -164,7 +166,10 @@ void ChromeProcessController::HandleTap(
     TapType aType, const mozilla::LayoutDevicePoint& aPoint,
     Modifiers aModifiers, const ScrollableLayerGuid& aGuid,
     uint64_t aInputBlockId) {
+  MOZ_LOG(sApzChromeLog, LogLevel::Debug,
+          ("HandleTap called with %d\n", aType));
   if (MessageLoop::current() != mUILoop) {
+    MOZ_LOG(sApzChromeLog, LogLevel::Debug, ("HandleTap redispatching\n"));
     mUILoop->PostTask(
         NewRunnableMethod<TapType, mozilla::LayoutDevicePoint, Modifiers,
                           ScrollableLayerGuid, uint64_t>(

gfx/layers/ipc/RemoteContentController.cpp

@@ -18,6 +18,8 @@
 #include "mozilla/Unused.h"
 #include "Units.h"
 
+static mozilla::LazyLogModule sApzRemoteLog("apz.cc.remote");
+
 namespace mozilla {
 namespace layers {
 
@@ -57,6 +59,8 @@ void RemoteContentController::HandleTapOnMainThread(TapType aTapType,
                                                     Modifiers aModifiers,
                                                     ScrollableLayerGuid aGuid,
                                                     uint64_t aInputBlockId) {
+  MOZ_LOG(sApzRemoteLog, LogLevel::Debug,
+          ("HandleTapOnMainThread(%d)", aTapType));
   MOZ_ASSERT(NS_IsMainThread());
 
   dom::BrowserParent* tab =
@@ -87,6 +91,7 @@ void RemoteContentController::HandleTap(TapType aTapType,
                                         Modifiers aModifiers,
                                         const ScrollableLayerGuid& aGuid,
                                         uint64_t aInputBlockId) {
+  MOZ_LOG(sApzRemoteLog, LogLevel::Debug, ("HandleTap(%d)", aTapType));
   APZThreadUtils::AssertOnControllerThread();
 
   if (XRE_GetProcessType() == GeckoProcessType_GPU) {