Include Resize button that will scale the viewport

 - This is the first pass at adding a method for resizing the
   video element in the window. This was initially tied to the
   window resize event but this resulted in poor performance as
   the resize call happened too frequently.
 - Submitting this CL as a stop-gap until we can figure out a
   more optimized method for handling window resizing.

Test: Build, boot, resize test at multiple resolutions
Bug: 149793288
Change-Id: I50db4f49c421e545a8f21c58c2f7300d7bc16b4a
diff --git a/host_package.mk b/host_package.mk
index 5a17fcf..cddfd09 100644
--- a/host_package.mk
+++ b/host_package.mk
@@ -88,8 +88,9 @@
 webrtc_assets := \
     index.html \
     style.css \
-    js/receive.js \
     js/logcat.js \
+    js/receive.js \
+    js/viewpane.js \
 
 webrtc_certs := \
     server.crt \