Camera: Pass system health metrics to ServiceProxy

- Measure session statistics:
  - Camera open, close, and session creation latency
  - Session information such as camera id, is_ndk, operating mode,
    and reconfiguration count.
- Measure stream statistics:
  - width, height, format, dataspace, usage
  - max buffer count
  - buffer loss count
  - startup latency.

Test: ./out/host/linux-x86/bin/statsd_testdrive 227
Test: Camera CTS, VNDK test
Bug: 154159000
Change-Id: I082ef26a312bddbfd4abcc2148728a4b7bf8a9f6
diff --git a/services/camera/libcameraservice/device3/Camera3Stream.cpp b/services/camera/libcameraservice/device3/Camera3Stream.cpp
index f208561..9a8f6fe 100644
--- a/services/camera/libcameraservice/device3/Camera3Stream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Stream.cpp
@@ -152,6 +152,10 @@
     return mPhysicalCameraId;
 }
 
+int Camera3Stream::getMaxHalBuffers() const {
+    return camera3_stream::max_buffers;
+}
+
 void Camera3Stream::setOfflineProcessingSupport(bool support) {
     mSupportOfflineProcessing = support;
 }