Update Android camera switch API to allow specifying a name

The current camera switch API sequentially cycles through each
camera name for each method invocation. This policy provides
reasonable behavior for devices with 2 or 3 cameras, but
presents challenges with devices that contain several cameras.
For example in a scenario where the current camera is oriented
on the same side as the next camera name, a developer would need to
call switchCamera multiple times to capture from a camera oriented on
a different side of the device.

This commit allows a developer to specify a camera name when switching
cameras. This flexibility allows developers to have more control over
which device they switch to in cases where a device contains several cameras.

Bug: webrtc:11261
Change-Id: I93d46d70b2c7cf735a411a4ef4f33e926bf3a5ea
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/165040
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30199}

sdk/android/instrumentationtests/src/org/webrtc/Camera2CapturerTest.java

@@ -237,6 +237,12 @@ public class Camera2CapturerTest {
     fixtures.switchCamera();
   }
 
+  @Test
+  @MediumTest
+  public void testSwitchVideoCapturerToSpecificCameraName() throws InterruptedException {
+    fixtures.switchCamera(true /* specifyCameraName */);
+  }
+
   @Test
   @MediumTest
   public void testCameraEvents() throws InterruptedException {