headless: Initial headless embedder API implementation

headless/lib/browser/headless_browser_context.cc

+// Copyright 2015 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 "headless/lib/browser/headless_browser_context.h"
+
+#include "base/path_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/resource_context.h"
+#include "content/public/browser/storage_partition.h"
+#include "headless/lib/browser/headless_url_request_context_getter.h"
+#include "net/url_request/url_request_context.h"
+
+namespace headless {
+
+// Contains net::URLRequestContextGetter required for resource loading.
+// Must be destructed on the IO thread as per content::ResourceContext
+// requirements.
+class HeadlessResourceContext : public content::ResourceContext {
+ public:
+  HeadlessResourceContext();
+  ~HeadlessResourceContext() override;
+
+  // ResourceContext implementation:
+  net::HostResolver* GetHostResolver() override;
+  net::URLRequestContext* GetRequestContext() override;
+
+  void set_url_request_context_getter(

[Ryan Sleevi, 2016/02/25 22:04:36]

Document? What thread(s) can/is this called on?

[Sami, 2016/02/26 18:49:16]

Done.

+      scoped_refptr<net::URLRequestContextGetter> url_request_context_getter) {
+    url_request_context_getter_ = url_request_context_getter;

[Ryan Sleevi, 2016/02/25 22:04:36]

std::move

[Sami, 2016/02/26 18:49:16]

Done.

+  }
+
+ private:
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
+
+  DISALLOW_COPY_AND_ASSIGN(HeadlessResourceContext);
+};
+
+HeadlessResourceContext::HeadlessResourceContext() {}
+
+HeadlessResourceContext::~HeadlessResourceContext() {}
+
+net::HostResolver* HeadlessResourceContext::GetHostResolver() {
+  CHECK(url_request_context_getter_);

[Ryan Sleevi, 2016/02/25 22:04:36]

I assume the contract here that you're trying to document is that
set_url_request_context_getter must be called before
GetHostResolver/GetRequestContext? That's something ideally documented around
line 28

[Sami, 2016/02/26 18:49:16]

Indeed, added a comment to that effect.

+  return url_request_context_getter_->GetURLRequestContext()->host_resolver();
+}
+
+net::URLRequestContext* HeadlessResourceContext::GetRequestContext() {
+  CHECK(url_request_context_getter_);
+  return url_request_context_getter_->GetURLRequestContext();
+}
+
+HeadlessBrowserContext::HeadlessBrowserContext(
+    const HeadlessBrowser::Options& options)
+    : resource_context_(new HeadlessResourceContext), options_(options) {
+  InitWhileIOAllowed();
+}
+
+HeadlessBrowserContext::~HeadlessBrowserContext() {
+  if (resource_context_) {
+    content::BrowserThread::DeleteSoon(content::BrowserThread::IO, FROM_HERE,
+                                       resource_context_.release());
+  }
+}
+
+void HeadlessBrowserContext::InitWhileIOAllowed() {
+  // TODO(skyostil): Allow the embedder to override this.
+  PathService::Get(base::DIR_EXE, &path_);
+}
+
+scoped_ptr<content::ZoomLevelDelegate>
+HeadlessBrowserContext::CreateZoomLevelDelegate(
+    const base::FilePath& partition_path) {
+  return scoped_ptr<content::ZoomLevelDelegate>();
+}
+
+base::FilePath HeadlessBrowserContext::GetPath() const {
+  return path_;
+}
+
+bool HeadlessBrowserContext::IsOffTheRecord() const {
+  return false;
+}
+
+net::URLRequestContextGetter* HeadlessBrowserContext::GetRequestContext() {
+  return GetDefaultStoragePartition(this)->GetURLRequestContext();
+}
+
+net::URLRequestContextGetter*
+HeadlessBrowserContext::GetRequestContextForRenderProcess(
+    int renderer_child_id) {
+  return GetRequestContext();
+}
+
+net::URLRequestContextGetter* HeadlessBrowserContext::GetMediaRequestContext() {
+  return GetRequestContext();
+}
+
+net::URLRequestContextGetter*
+HeadlessBrowserContext::GetMediaRequestContextForRenderProcess(
+    int renderer_child_id) {
+  return GetRequestContext();
+}
+
+net::URLRequestContextGetter*
+HeadlessBrowserContext::GetMediaRequestContextForStoragePartition(
+    const base::FilePath& partition_path,
+    bool in_memory) {
+  return GetRequestContext();
+}
+
+content::ResourceContext* HeadlessBrowserContext::GetResourceContext() {
+  return resource_context_.get();
+}
+
+content::DownloadManagerDelegate*
+HeadlessBrowserContext::GetDownloadManagerDelegate() {
+  return nullptr;
+}
+
+content::BrowserPluginGuestManager* HeadlessBrowserContext::GetGuestManager() {
+  // TODO(altimin): Should be non-null? (is null in content/shell).
+  return nullptr;
+}
+
+storage::SpecialStoragePolicy*
+HeadlessBrowserContext::GetSpecialStoragePolicy() {
+  return nullptr;
+}
+
+content::PushMessagingService*
+HeadlessBrowserContext::GetPushMessagingService() {
+  return nullptr;
+}
+
+content::SSLHostStateDelegate*
+HeadlessBrowserContext::GetSSLHostStateDelegate() {
+  return nullptr;
+}
+
+content::PermissionManager* HeadlessBrowserContext::GetPermissionManager() {
+  return nullptr;
+}
+
+content::BackgroundSyncController*
+HeadlessBrowserContext::GetBackgroundSyncController() {
+  return nullptr;
+}
+
+void HeadlessBrowserContext::SetURLRequestContextGetter(
+    scoped_refptr<net::URLRequestContextGetter> url_request_context_getter) {
+  resource_context_->set_url_request_context_getter(url_request_context_getter);
+}
+
+}  // namespace headless