ozone: Add sync flag for atomic commit and page flip event handling

Committed: https://crrev.com/f7553583492a8ea9a54d75cd6b2d3dd83c94512c
Cr-Commit-Position: refs/heads/master@{#326863}

Review URL: https://codereview.chromium.org/1099713005

Cr-Commit-Position: refs/heads/master@{#329919}

ui/ozone/platform/drm/gpu/drm_device.cc

@@ -559,20 +559,30 @@ bool DrmDevice::CloseBufferHandle(uint32_t handle) {
 
 bool DrmDevice::CommitProperties(drmModePropertySet* properties,
                                  uint32_t flags,
+                                 bool is_sync,
                                  const PageFlipCallback& callback) {
 #if defined(USE_DRM_ATOMIC)
+  flags |= DRM_MODE_PAGE_FLIP_EVENT;
   scoped_ptr<PageFlipPayload> payload(
       new PageFlipPayload(base::ThreadTaskRunnerHandle::Get(), callback));
+  uint64_t id = page_flip_manager_->GetNextId();
   if (!drmModePropertySetCommit(file_.GetPlatformFile(), flags, payload.get(),
                                 properties)) {
-    // If successful the payload will be removed by the event
-    ignore_result(payload.release());
+    page_flip_manager_->RegisterCallback(id, callback);
+
+    // If the flip was requested synchronous or if no watcher has been installed
+    // yet, then synchronously handle the page flip events.
+    if (is_sync || !watcher_) {
+      TRACE_EVENT1("drm", "OnDrmEvent", "socket", file_.GetPlatformFile());
+
+      ProcessDrmEvent(
+          file_.GetPlatformFile(),
+          base::Bind(&PageFlipManager::OnPageFlip, page_flip_manager_));
+    }
     return true;
   }
-  return false;
-#else
-  return false;
 #endif  // defined(USE_DRM_ATOMIC)
+  return false;
 }
 
 bool DrmDevice::SetCapability(uint64_t capability, uint64_t value) {

ui/ozone/platform/drm/gpu/drm_device.h

@@ -159,6 +159,7 @@ class OZONE_EXPORT DrmDevice : public base::RefCountedThreadSafe<DrmDevice> {
 
   virtual bool CommitProperties(drmModePropertySet* properties,
                                 uint32_t flags,
+                                bool is_sync,
                                 const PageFlipCallback& callback);
 
   // Set the gamma ramp for |crtc_id| to reflect the ramps in |lut|.

ui/ozone/platform/drm/gpu/hardware_display_plane_manager_atomic.cc

@@ -41,7 +41,7 @@ bool HardwareDisplayPlaneManagerAtomic::Commit(
 
   plane_list->plane_list.swap(plane_list->old_plane_list);
   plane_list->plane_list.clear();
-  if (!drm_->CommitProperties(plane_list->atomic_property_set.get(), 0,
+  if (!drm_->CommitProperties(plane_list->atomic_property_set.get(), 0, is_sync,
                               base::Bind(&AtomicPageFlipCallback))) {
     PLOG(ERROR) << "Failed to commit properties";
     return false;

ui/ozone/platform/drm/test/mock_drm_device.cc

@@ -236,6 +236,7 @@ bool MockDrmDevice::CloseBufferHandle(uint32_t handle) {
 
 bool MockDrmDevice::CommitProperties(drmModePropertySet* properties,
                                      uint32_t flags,
+                                     bool is_sync,
                                      const PageFlipCallback& callback) {
   return false;
 }

ui/ozone/platform/drm/test/mock_drm_device.h

@@ -108,6 +108,7 @@ class MockDrmDevice : public ui::DrmDevice {
   bool CloseBufferHandle(uint32_t handle) override;
   bool CommitProperties(drmModePropertySet* properties,
                         uint32_t flags,
+                        bool is_sync,
                         const PageFlipCallback& callback) override;
   bool SetGammaRamp(uint32_t crtc_id,
                     const std::vector<GammaRampRGBEntry>& lut) override;