Handle basic navigation controls without webcontents in VR Shell.

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
index b5f9ce36dd28985b4dcb6b00b7c5efa7fafcb7d9..20b26f4d5eb4b31195b8858f423f10154f3b9560 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
@@ -29,6 +29,7 @@ import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.NativePage;
 import org.chromium.chrome.browser.WebContentsFactory;
 import org.chromium.chrome.browser.compositor.CompositorViewHolder;
+import org.chromium.chrome.browser.omnibox.geo.GeolocationHeader;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabObserver;
@@ -40,6 +41,7 @@ import org.chromium.chrome.browser.tabmodel.TabModelSelectorObserver;
 import org.chromium.chrome.browser.tabmodel.TabModelSelectorTabObserver;
 import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.UiUtils;
 import org.chromium.ui.base.ViewAndroidDelegate;
@@ -533,6 +535,29 @@ public class VrShellImpl extends GvrLayout implements VrShell, SurfaceHolder.Cal
         };
     }
 
+    @CalledByNative
+    public void navigateForward() {
+        mActivity.getToolbarManager().forward();
+    }
+
+    @CalledByNative
+    public void navigateBack() {
+        mActivity.getToolbarManager().back();
+    }
+
+    @CalledByNative
+    public void loadURL(String url, int transition) {
+        LoadUrlParams loadUrlParams = new LoadUrlParams(url);
+        loadUrlParams.setVerbatimHeaders(GeolocationHeader.getGeoHeader(url, mTab));
+        loadUrlParams.setTransitionType(transition);
+        mTab.loadUrl(loadUrlParams);
+    }
+
+    @CalledByNative
+    public void reload() {
+        mTab.reload();
+    }
+
     private native long nativeInit(WebContents uiWebContents, long nativeContentWindowAndroid,
             long nativeUiWindowAndroid, boolean forWebVR, VrShellDelegate delegate, long gvrApi,
             boolean reprojectedRendering);