Move camera implementation details away from the public API.

webrtc/sdk/android/BUILD.gn

Index: webrtc/sdk/android/BUILD.gn
diff --git a/webrtc/sdk/android/BUILD.gn b/webrtc/sdk/android/BUILD.gn
index 3fa7cb8dc5070f1f448ccc36f8983102b303547f..3329b04e01f0634434060cedd7a0d2aec56aea8a 100644
--- a/webrtc/sdk/android/BUILD.gn
+++ b/webrtc/sdk/android/BUILD.gn
@@ -130,14 +130,10 @@ android_library("libjingle_peerconnection_java") {
     "api/org/webrtc/CallSessionFileRotatingLogSink.java",
     "api/org/webrtc/Camera1Capturer.java",
     "api/org/webrtc/Camera1Enumerator.java",
-    "api/org/webrtc/Camera1Session.java",
     "api/org/webrtc/Camera2Capturer.java",
     "api/org/webrtc/Camera2Enumerator.java",
-    "api/org/webrtc/Camera2Session.java",
-    "api/org/webrtc/CameraCapturer.java",
     "api/org/webrtc/CameraEnumerationAndroid.java",
     "api/org/webrtc/CameraEnumerator.java",
-    "api/org/webrtc/CameraSession.java",
     "api/org/webrtc/CameraVideoCapturer.java",
     "api/org/webrtc/DataChannel.java",
     "api/org/webrtc/DtmfSender.java",
@@ -180,6 +176,10 @@ android_library("libjingle_peerconnection_java") {
     "api/org/webrtc/VideoSource.java",
     "api/org/webrtc/VideoTrack.java",
     "api/org/webrtc/YuvConverter.java",
+    "src/java/org/webrtc/Camera1Session.java",
+    "src/java/org/webrtc/Camera2Session.java",
+    "src/java/org/webrtc/CameraCapturer.java",
+    "src/java/org/webrtc/CameraSession.java",
   ]
 
   deps = [