Handle basic navigation controls without webcontents in VR Shell.

chrome/browser/android/vr_shell/vr_shell.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 
 #include <android/native_window_jni.h>
 
 #include <string>
 #include <utility>
@@ skipping 390 matching lines @@
 }
 
 void VrShell::UpdateScene(const base::ListValue* args) {
   PostToGlThreadWhenReady(base::Bind(&VrShellGl::UpdateScene,
                                      gl_thread_->GetVrShellGl(),
                                      base::Passed(args->CreateDeepCopy())));
 }
 
 void VrShell::DoUiAction(const UiAction action,
                          const base::DictionaryValue* arguments) {
+  // Actions that can be handled natively.
   switch (action) {
     case OMNIBOX_CONTENT:
       html_interface_->HandleOmniboxInput(*arguments);
       return;
     case SET_CONTENT_PAUSED: {
       bool paused;
       CHECK(arguments->GetBoolean("paused", &paused));
       SetContentPaused(paused);
       return;
     }
-    default:
+    case HISTORY_BACK:
+      if (main_contents_ && main_contents_->IsFullscreen()) {
+        main_contents_->ExitFullscreen(false);
+        return;
+      }
+      // Otherwise handle in java.
       break;
-  }
-  // TODO(mthiesse): Handles these in java through the Tab.
-  if (!main_contents_)
-    return;
-  content::NavigationController& controller = main_contents_->GetController();
-  switch (action) {
-    case HISTORY_BACK:
-      if (main_contents_->IsFullscreen()) {
-        main_contents_->ExitFullscreen(false);
-      } else if (controller.CanGoBack()) {
-        controller.GoBack();
-      }
-      break;
-    case HISTORY_FORWARD:
-      if (controller.CanGoForward())
-        controller.GoForward();
-      break;
-    case RELOAD:
-      controller.Reload(content::ReloadType::NORMAL, false);
-      break;
-    case LOAD_URL: {
-      std::string url_string;
-      CHECK(arguments->GetString("url", &url_string));
-      GURL url(url_string);
-      // TODO(crbug.com/683344): Sanitize the URL and prefix, and pass the
-      // proper transition type down from the UI.
-      controller.LoadURL(url, content::Referrer(),
-                         ui::PageTransition::PAGE_TRANSITION_AUTO_TOPLEVEL,
-                         std::string(""));
-      break;
-    }
+    case ZOOM_OUT:  // Not handled yet.
+    case ZOOM_IN:   // Not handled yet.
+      return;
 #if defined(ENABLE_VR_SHELL_UI_DEV)
     case RELOAD_UI:
       ui_contents_->GetController().Reload(content::ReloadType::NORMAL, false);
       html_interface_.reset(new UiInterface(UiInterface::Mode::STANDARD));
       SetUiState();
       vr_web_contents_observer_->SetUiInterface(html_interface_.get());
+      return;
+#endif
+    default:
       break;
-#endif
-    case ZOOM_OUT:  // Not handled yet.
-    case ZOOM_IN:  // Not handled yet.
+  }
+  // Actions that are handled in java.
+  JNIEnv* env = base::android::AttachCurrentThread();
+  switch (action) {
+    case HISTORY_BACK:
+      Java_VrShellImpl_navigateBack(env, j_vr_shell_.obj());
       break;
+    case HISTORY_FORWARD:
+      Java_VrShellImpl_navigateForward(env, j_vr_shell_.obj());
+      break;
+    case RELOAD:
+      Java_VrShellImpl_reload(env, j_vr_shell_.obj());
+      break;
+    case LOAD_URL: {
+      base::string16 url_string;
+      CHECK(arguments->GetString("url", &url_string));
+      base::android::ScopedJavaLocalRef<jstring> string =
+          base::android::ConvertUTF16ToJavaString(env, url_string);
+      Java_VrShellImpl_loadURL(env, j_vr_shell_.obj(), string,
+                               ui::PageTransition::PAGE_TRANSITION_TYPED);
+      break;
+    }
     default:
       NOTREACHED();
   }
 }
 
 void VrShell::RenderViewHostChanged(content::RenderViewHost* old_host,
                                     content::RenderViewHost* new_host) {
   new_host->GetWidget()->GetView()->SetBackgroundColor(SK_ColorTRANSPARENT);
 }
 
@@ skipping 176 matching lines @@
            jboolean reprojected_rendering) {
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, reinterpret_cast<ui::WindowAndroid*>(content_window_android),
       content::WebContents::FromJavaWebContents(ui_web_contents),
       reinterpret_cast<ui::WindowAndroid*>(ui_window_android), for_web_vr,
       VrShellDelegate::GetNativeVrShellDelegate(env, delegate),
       reinterpret_cast<gvr_context*>(gvr_api), reprojected_rendering));
 }
 
 }  // namespace vr_shell