IPC-based sync compositor software draw optimization

content/common/android/sync_compositor_messages.h

Index: content/common/android/sync_compositor_messages.h
diff --git a/content/common/android/sync_compositor_messages.h b/content/common/android/sync_compositor_messages.h
index 0e142143716ac283011907f8057c87b8a718d476..3a1d0f584d7f0ee19684e32e5de5c91c5b4f901c 100644
--- a/content/common/android/sync_compositor_messages.h
+++ b/content/common/android/sync_compositor_messages.h
@@ -48,6 +48,13 @@ struct SyncCompositorDemandDrawHwParams {
   gfx::Transform transform_for_tile_priority;
 };
 
+struct SyncCompositorSetSharedMemoryParams {
+  SyncCompositorSetSharedMemoryParams();
+
+  size_t buffer_size;
+  base::SharedMemoryHandle shm_handle;
+};
+
 struct SyncCompositorDemandDrawSwParams {
   SyncCompositorDemandDrawSwParams();
   ~SyncCompositorDemandDrawSwParams();
@@ -55,7 +62,6 @@ struct SyncCompositorDemandDrawSwParams {
   gfx::Size size;
   gfx::Rect clip;
   gfx::Transform transform;
-  base::SharedMemoryHandle shm_handle;
 };
 
 struct SyncCompositorCommonRendererParams {
@@ -101,11 +107,15 @@ IPC_STRUCT_TRAITS_BEGIN(content::SyncCompositorDemandDrawHwParams)
   IPC_STRUCT_TRAITS_MEMBER(transform_for_tile_priority)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::SyncCompositorSetSharedMemoryParams)
+  IPC_STRUCT_TRAITS_MEMBER(buffer_size)
+  IPC_STRUCT_TRAITS_MEMBER(shm_handle)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(content::SyncCompositorDemandDrawSwParams)
   IPC_STRUCT_TRAITS_MEMBER(size)
   IPC_STRUCT_TRAITS_MEMBER(clip)
   IPC_STRUCT_TRAITS_MEMBER(transform)
-  IPC_STRUCT_TRAITS_MEMBER(shm_handle)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::SyncCompositorCommonRendererParams)
@@ -146,6 +156,14 @@ IPC_SYNC_MESSAGE_ROUTED2_2(SyncCompositorMsg_DemandDrawHw,
                            content::SyncCompositorCommonRendererParams,
                            cc::CompositorFrame)
 
+IPC_SYNC_MESSAGE_ROUTED2_2(SyncCompositorMsg_SetSharedMemory,
+                           content::SyncCompositorCommonBrowserParams,
+                           content::SyncCompositorSetSharedMemoryParams,
+                           bool /* success */,
+                           content::SyncCompositorCommonRendererParams);
+
+IPC_MESSAGE_ROUTED0(SyncCompositorMsg_ZeroSharedMemory);
+
 IPC_SYNC_MESSAGE_ROUTED2_3(SyncCompositorMsg_DemandDrawSw,
                            content::SyncCompositorCommonBrowserParams,
                            content::SyncCompositorDemandDrawSwParams,