Android WebView: add rules for jarjar.

Add jarjar rules that will rename all the Java classes defined in
Chromium code to be under a private package name when building the
WebView. This is only used when building inside the Android tree, so
does not affect upstream testing.

BUG=
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/16154019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203926 0039d316-1c4b-4281-b951-d872f2087c98

android_webview/build/jarjar-rules.txt

+rule org.chromium.** com.android.internal.webviewchromium.@1
+rule com.google.common.** com.android.internal.webviewchromium.guava.@1
+rule com.googlecode.eyesfree.** com.android.internal.webviewchromium.eyesfree.@1
+rule javax.annotation.** com.android.internal.webviewchromium.jsr305.@1