Add support for HAL_PIXEL_FORMAT_YCbCr_420_888

- Add fields to CpuConsumer::LockedBuffer for new information
- New lock methods for GraphicBuffer and GraphicBufferMapper for
  the format

Bug: 8734880
Change-Id: If31f82c62d64b6942cf4cc6e5715585c03273f12
diff --git a/include/ui/GraphicBuffer.h b/include/ui/GraphicBuffer.h
index ea9368d..e5ad1e0 100644
--- a/include/ui/GraphicBuffer.h
+++ b/include/ui/GraphicBuffer.h
@@ -92,6 +92,9 @@
 
     status_t lock(uint32_t usage, void** vaddr);
     status_t lock(uint32_t usage, const Rect& rect, void** vaddr);
+    // For HAL_PIXEL_FORMAT_YCbCr_420_888
+    status_t lockYCbCr(uint32_t usage, android_ycbcr *ycbcr);
+    status_t lockYCbCr(uint32_t usage, const Rect& rect, android_ycbcr *ycbcr);
     status_t unlock();
 
     ANativeWindowBuffer* getNativeBuffer() const;