Bump versionCode of SkyDemo.apk to avoid downgrade warning.

Also teach both skydb and shelldb to ignore version downgrades
I did not change sky_tool since maybe the warning makes sense
there?

R=abarth@chromium.org, chinmaygarde@google.com

Review URL: https://codereview.chromium.org/1138343002

apk/demo/AndroidManifest.xml

@@ -5,7 +5,7 @@
  -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.domokit.sky.demo"
-    android:versionCode="3"
+    android:versionCode="7"
     android:versionName="0.0.1">
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />

tools/shelldb

@@ -175,7 +175,8 @@ class StartSky(object):
         pids['build_dir'] = os.path.abspath(args.build_dir)
 
         if args.install:
-            subprocess.check_call([ADB_PATH, 'install', '-r', apk_path])
+            # -r to replace an existing apk, -d to allow version downgrade.
+            subprocess.check_call([ADB_PATH, 'install', '-r', '-d', apk_path])
 
         port_string = 'tcp:%s' % sky_server.port
         subprocess.check_call([

tools/skydb

@@ -226,7 +226,8 @@ class SkyDebugger(object):
             subprocess.check_call([ADB_PATH, 'root'])
 
             # We could make installing conditional on an argument.
-            subprocess.check_call([ADB_PATH, 'install', '-r', apk_path])
+            # -r to replace an existing apk, -d to allow version downgrade.
+            subprocess.check_call([ADB_PATH, 'install', '-r', '-d', apk_path])
 
             port_string = 'tcp:%s' % sky_server.port
             subprocess.check_call([