bufferhubd: Implement more DetachedBuffer logic
1/ Separate DetachedBuffer related logic into a dedicated subclass of
BufferHubRPC. This actually is the right thing to do as it utilizes
the PDX's client/service programming pattern better.
2/ Add IsValid() check for the DetachedBufferChannel object.
3/ Add BufferHubClient to handle general PDX operations.
4/ Add DetachedBuffer which composites a BufferHubClient.
5/ Fully functional logic of allocating a DetachedBuffer, converting it
to a BufferHub-backed GraphicBuffer, then converting it back to a
DetachedBuffer.
Bug: 38137191
Bug: 70046255
Bug: 70912269
Test: buffer_hub-test
Change-Id: I81bf9259cbbaeb29a6df2769363b5a03464e7864
diff --git a/libs/vr/libpdx/private/pdx/mock_client_channel.h b/libs/vr/libpdx/private/pdx/mock_client_channel.h
index ecc20b3..b1a1299 100644
--- a/libs/vr/libpdx/private/pdx/mock_client_channel.h
+++ b/libs/vr/libpdx/private/pdx/mock_client_channel.h
@@ -14,6 +14,7 @@
MOCK_CONST_METHOD0(GetEventSources, std::vector<EventSource>());
MOCK_METHOD1(GetEventMask, Status<int>(int));
MOCK_METHOD0(GetChannelHandle, LocalChannelHandle&());
+ MOCK_CONST_METHOD0(GetChannelHandle, const LocalChannelHandle&());
MOCK_METHOD0(AllocateTransactionState, void*());
MOCK_METHOD1(FreeTransactionState, void(void* state));
MOCK_METHOD3(SendImpulse,