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/BrowserSettings.java b/src/com/android/browser/BrowserSettings.java
index cfaa18a..2c0b2ec 100644
--- a/src/com/android/browser/BrowserSettings.java
+++ b/src/com/android/browser/BrowserSettings.java
@@ -268,6 +268,9 @@
 
         settings.setProperty(WebViewProperties.gfxInvertedScreenContrast,
                 Float.toString(getInvertedContrast()));
+
+        settings.setProperty(WebViewProperties.gfxEnableCpuUploadPath,
+                enableCpuUploadPath() ? "true" : "false");
     }
 
     /**
@@ -672,6 +675,13 @@
         return mPrefs.getBoolean(PREF_ENABLE_VISUAL_INDICATOR, false);
     }
 
+    public boolean enableCpuUploadPath() {
+        if (!isDebugEnabled()) {
+            return true;
+        }
+        return mPrefs.getBoolean(PREF_ENABLE_CPU_UPLOAD_PATH, true);
+    }
+
     public boolean enableJavascriptConsole() {
         if (!isDebugEnabled()) {
             return false;