Adds plumbing to pass WebUI mojo::Handle from browser to renderer

content/browser/webui/web_ui_mojo_browsertest.cc

Index: content/browser/webui/web_ui_mojo_browsertest.cc
diff --git a/content/browser/webui/web_ui_mojo_browsertest.cc b/content/browser/webui/web_ui_mojo_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6e8897ea032feef230eec2bcedbd582930362645
--- /dev/null
+++ b/content/browser/webui/web_ui_mojo_browsertest.cc
@@ -0,0 +1,195 @@
+// Copyright 2014 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 "base/command_line.h"
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/run_loop.h"
+#include "base/strings/string_util.h"
+#include "content/browser/webui/web_ui_controller_factory_registry.h"
+#include "content/common/mojo/mojo_channel_init.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui_controller.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/common/content_paths.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/url_utils.h"
+#include "content/test/content_browser_test.h"
+#include "content/test/content_browser_test_utils.h"
+#include "content/test/data/web_ui_test_mojo_bindings.mojom.h"
+#include "grit/content_resources.h"
+#include "mojo/public/bindings/js/constants.h"
+#include "mojo/public/bindings/remote_ptr.h"
+
+namespace content {
+namespace {
+
+bool got_message = false;
+
+// Returns the path to the mojom js bindings file.
+base::FilePath GetFilePathForJSResource(const std::string& path) {
+  std::string binding_path = "gen/" + path + ".js";
+#if defined(OS_WIN)
+  std::string tmp;
+  base::ReplaceChars(binding_path, "//", "\\", &tmp);
+  binding_path.swap(tmp);
+#endif
+  base::FilePath file_path;
+  PathService::Get(CHILD_PROCESS_EXE, &file_path);
+  return file_path.DirName().AppendASCII(binding_path);
+}
+
+// The bindings for the page are generated from a .mojom file. This code looks
+// up the generated file from disk and returns it.
+bool GetResource(const std::string& id,
+                 const WebUIDataSource::GotDataCallback& callback) {
+  // These are handled by the WebUIDataSource that AddMojoDataSource() creates.
+  if (id == mojo::kCodecModuleName || id == mojo::kConnectorModuleName)
+    return false;
+
+  std::string contents;
+  CHECK(base::ReadFileToString(GetFilePathForJSResource(id), &contents,
+                               std::string::npos));
+  base::RefCountedString* ref_contents = new base::RefCountedString;
+  ref_contents->data() = contents;
+  callback.Run(ref_contents);
+  return true;
+}
+
+// BrowserTarget implementation that quits a RunLoop when BrowserTarget::Test()
+// is called.
+class BrowserTargetImpl : public mojo::BrowserTarget {
+ public:
+  BrowserTargetImpl(mojo::ScopedRendererTargetHandle handle,
+                    base::RunLoop* run_loop)
+      : client_(handle.Pass(), this),
+        run_loop_(run_loop) {
+    client_->Test();
+  }
+  virtual ~BrowserTargetImpl() {}
+
+  // mojo::BrowserTarget overrides:
+  virtual void Test() OVERRIDE {
+    got_message = true;
+    run_loop_->Quit();
+  }
+
+ private:
+  mojo::RemotePtr<mojo::RendererTarget> client_;
+
+  base::RunLoop* run_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserTargetImpl);
+};
+
+// WebUIController that sets up mojo bindings. Additionally it creates the
+// BrowserTarget implementation at the right time.
+class TestWebUIController : public WebUIController {
+ public:
+  explicit TestWebUIController(WebUI* web_ui, base::RunLoop* run_loop)
+      : WebUIController(web_ui),
+        run_loop_(run_loop) {
+    content::WebUIDataSource* data_source =
+        WebUIDataSource::AddMojoDataSource(
+            web_ui->GetWebContents()->GetBrowserContext());
+    data_source->SetRequestFilter(base::Bind(&GetResource));
+  }
+
+  // WebUIController overrides:
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE {
+    mojo::InterfacePipe<mojo::BrowserTarget, mojo::RendererTarget> pipe;
+    browser_target_.reset(
+        new BrowserTargetImpl(pipe.handle_to_peer.Pass(), run_loop_));
+    render_view_host->SetWebUIHandle(
+        mojo::ScopedMessagePipeHandle(pipe.handle_to_self.release()));
+  }
+
+ private:
+  base::RunLoop* run_loop_;
+
+  scoped_ptr<BrowserTargetImpl> browser_target_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWebUIController);
+};
+
+// WebUIControllerFactory that creates TestWebUIController.
+class TestWebUIControllerFactory : public WebUIControllerFactory {
+ public:
+  TestWebUIControllerFactory() : run_loop_(NULL) {}
+
+  void set_run_loop(base::RunLoop* run_loop) { run_loop_ = run_loop; }
+
+  virtual WebUIController* CreateWebUIControllerForURL(
+      WebUI* web_ui, const GURL& url) const OVERRIDE {
+    return new TestWebUIController(web_ui, run_loop_);
+  }
+  virtual WebUI::TypeID GetWebUIType(BrowserContext* browser_context,
+      const GURL& url) const OVERRIDE {
+    return reinterpret_cast<WebUI::TypeID>(1);
+  }
+  virtual bool UseWebUIForURL(BrowserContext* browser_context,
+                              const GURL& url) const OVERRIDE {
+    return true;
+  }
+  virtual bool UseWebUIBindingsForURL(BrowserContext* browser_context,
+                                      const GURL& url) const OVERRIDE {
+    return true;
+  }
+
+ private:
+  base::RunLoop* run_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWebUIControllerFactory);
+};
+
+class WebUIMojoTest : public ContentBrowserTest {
+ public:
+  WebUIMojoTest() {
+    MojoChannelInit::InitMojo();
+    WebUIControllerFactory::RegisterFactory(&factory_);
+  }
+
+  virtual ~WebUIMojoTest() {
+    WebUIControllerFactory::UnregisterFactoryForTesting(&factory_);
+  }
+
+  TestWebUIControllerFactory* factory() { return &factory_; }
+
+ private:
+  TestWebUIControllerFactory factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebUIMojoTest);
+};
+
+// Loads a webui page that contains mojo bindings and verifies a message makes
+// it from the browser to the page and back.
+IN_PROC_BROWSER_TEST_F(WebUIMojoTest, EndToEnd) {
+  // Currently there is no way to have a generated file included in the isolate
+  // files. If the bindings file doesn't exist assume we're on such a bot and
+  // pass.
+  // TODO(sky): remove this conditional when isolates support copying from gen.
+  const base::FilePath test_file_path(
+      GetFilePathForJSResource(
+          "content/test/data/web_ui_test_mojo_bindings.mojom"));
+  if (!base::PathExists(test_file_path)) {
+    LOG(WARNING) << " mojom binding file doesn't exist, assuming on isolate";
+    return;
+  }
+
+  got_message = false;
+  ASSERT_TRUE(test_server()->Start());
+  base::RunLoop run_loop;
+  factory()->set_run_loop(&run_loop);
+  GURL test_url(test_server()->GetURL("files/web_ui_mojo.html"));
+  NavigateToURL(shell(), test_url);
+  // RunLoop is quit when message received from page.
+  run_loop.Run();
+  EXPECT_TRUE(got_message);
+}
+
+}  // namespace
+}  // namespace content