sync compositor: Reduce begin frame sync IPC overhead

content/common/android/sync_compositor_messages.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/android/sync_compositor_messages.h"
 
 namespace content {
 
 SyncCompositorDemandDrawHwParams::SyncCompositorDemandDrawHwParams() {}
 
@@ skipping 13 matching lines @@
 
 SyncCompositorDemandDrawHwParams::~SyncCompositorDemandDrawHwParams() {}
 
 SyncCompositorSetSharedMemoryParams::SyncCompositorSetSharedMemoryParams()
     : buffer_size(0u) {}
 
 SyncCompositorDemandDrawSwParams::SyncCompositorDemandDrawSwParams() {}
 
 SyncCompositorDemandDrawSwParams::~SyncCompositorDemandDrawSwParams() {}
 
-SyncCompositorCommonRendererParams::SyncCompositorCommonRendererParams()
-    : version(0u),
-      page_scale_factor(0.f),
-      min_page_scale_factor(0.f),
-      max_page_scale_factor(0.f),
-      need_animate_scroll(false),
-      need_invalidate_count(0u),
-      did_activate_pending_tree_count(0u) {}
+SyncCompositorCommonRendererParams::SyncCompositorCommonRendererParams() =
+    default;
+
+SyncCompositorCommonRendererParams::SyncCompositorCommonRendererParams(
+    const SyncCompositorCommonRendererParams& other) = default;
 
 SyncCompositorCommonRendererParams::~SyncCompositorCommonRendererParams() {}
 
+SyncCompositorCommonRendererParams& SyncCompositorCommonRendererParams::
+operator=(const SyncCompositorCommonRendererParams& other) = default;
+
 }  // namespace content