UI for switching texture upload mode

For browser, default will be CPU upload until bug 5334978 fix.

bug:5347539

The webkit part is in
https://android-git.corp.google.com/g/#/c/137610/

Change-Id: Iec3a100dc142b28e54145f08a5c76210f8634cba
diff --git a/src/com/android/browser/WebViewProperties.java b/src/com/android/browser/WebViewProperties.java
index 9a656d7..c410038 100644
--- a/src/com/android/browser/WebViewProperties.java
+++ b/src/com/android/browser/WebViewProperties.java
@@ -18,4 +18,5 @@
 public interface WebViewProperties {
     static final String gfxInvertedScreen = "inverted";
     static final String gfxInvertedScreenContrast = "inverted_contrast";
+    static final String gfxEnableCpuUploadPath = "enable_cpu_upload_path";
 }