Run the later parts of startup as UI thread tasks

android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java

Index: android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java b/android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java
index 7c3ab76050d63f2521dafbd9e2263ff37d77995c..b443eb176b3980fca53603a4b447eb0973d5c1a5 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwBrowserProcess.java
@@ -11,6 +11,7 @@ import org.chromium.base.PathUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.content.app.LibraryLoader;
 import org.chromium.content.browser.AndroidBrowserProcess;
+import org.chromium.content.browser.StartupObserver;
 import org.chromium.content.common.ProcessInitException;
 
 /**
@@ -49,7 +50,8 @@ public abstract class AwBrowserProcess {
                 try {
                     LibraryLoader.ensureInitialized();
                     AndroidBrowserProcess.init(context,
-                            AndroidBrowserProcess.MAX_RENDERERS_SINGLE_PROCESS);
+                            AndroidBrowserProcess.MAX_RENDERERS_SINGLE_PROCESS,
+                            true, new StartupObserver());
                 } catch (ProcessInitException e) {
                     throw new RuntimeException("Cannot initialize WebView", e);
                 }