Make AndroidWebView shell init data reduction proxy from commandline

To enable data reduction proxy on the commandline, you need:

build/android/adb_android_webview_command_line --enable-spdy-proxy-auth
--spdy-proxy-auth-value=[your real key]

BUG=

Review URL: https://codereview.chromium.org/664243003

Cr-Commit-Position: refs/heads/master@{#300622}

android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java

@@ -32,10 +32,12 @@ import org.chromium.android_webview.AwBrowserContext;
 import org.chromium.android_webview.AwBrowserProcess;
 import org.chromium.android_webview.AwContents;
 import org.chromium.android_webview.AwContentsClient;
+import org.chromium.android_webview.AwContentsStatics;
 import org.chromium.android_webview.AwDevToolsServer;
 import org.chromium.android_webview.AwSettings;
 import org.chromium.android_webview.test.AwTestContainerView;
 import org.chromium.android_webview.test.NullContentsClient;
+import org.chromium.base.CommandLine;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.WebContents;
@@ -55,6 +57,11 @@ public class AwShellActivity extends Activity {
     private ImageButton mPrevButton;
     private ImageButton mNextButton;
 
+    // This is the same as data_reduction_proxy::switches::kEnableDataReductionProxy.
+    private static final String ENABLE_DATA_REDUCTION_PROXY = "enable-spdy-proxy-auth";
+    // This is the same as data_reduction_proxy::switches::kDataReductionProxyKey.
+    private static final String DATA_REDUCTION_PROXY_KEY = "spdy-proxy-auth-value";
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -82,6 +89,14 @@ public class AwShellActivity extends Activity {
         mAwTestContainerView.getAwContents().loadUrl(new LoadUrlParams(startupUrl));
         AwContents.setShouldDownloadFavicons();
         mUrlTextView.setText(startupUrl);
+
+        if (CommandLine.getInstance().hasSwitch(ENABLE_DATA_REDUCTION_PROXY)) {
+            String key = CommandLine.getInstance().getSwitchValue(DATA_REDUCTION_PROXY_KEY);
+            if (key != null && !key.isEmpty()) {
+                AwContentsStatics.setDataReductionProxyKey(key);
+                AwContentsStatics.setDataReductionProxyEnabled(true);
+            }
+        }
     }
 
     private AwTestContainerView createAwTestContainerView() {