Add support for complete isolation of storage and permissions (cache, cookies, localStorage, access grants, etc) on a per-request-context basis (issue #1044).

- CefRequestContext instances can be configured using a new CefRequestContextSettings structure passed to CefRequestContext::CreateContext.
- Scheme registration is now per-request-context using new CefRequestContext::RegisterSchemeHandlerFactory and ClearSchemeHandlerFactories methods.
- Cookie managers are now per-request-context by default and can be retrieved using a new CefRequestContext::GetDefaultCookieManager method.
- CefURLRequest::Create now accepts an optional CefRequestContext argument for associating a URL request with a context (browser process only).
- The CefRequestContextHandler associated with a CefRequestContext will not be released until all objects related to that context have been destroyed.
- When the cache path is empty an in-memory cache ("incognito mode") will be used for storage and no data will be persisted to disk.
- Add CefSettings.user_data_path which specifies the location where user data such as spell checking dictionary files will be stored on disk.
- Add asynchronous callbacks for all CefCookieManager methods.
- Add PK_LOCAL_APP_DATA and PK_USER_DATA path keys for retrieving user directories via CefGetPath.
- cefclient: Add "New Window" test that creates a new window unrelated to existing windows. When used in combination with `--request-context-per-browser` the new window will be given a new and isolated request context.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@2040 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_context_impl.h

@@ -13,6 +13,7 @@
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/net/pref_proxy_config_tracker.h"
 
 namespace content {
 class DownloadManagerDelegate;
@@ -21,12 +22,21 @@ class SpeechRecognitionPreferences;
 
 class CefDownloadManagerDelegate;
 
-// Global BrowserContext implementation. Life span is controlled by
-// CefRequestContextImpl and CefBrowserMainParts. Only accessed on the UI
-// thread. See browser_context.h for an object relationship diagram.
+// Isolated BrowserContext implementation. Life span is controlled by
+// CefRequestContextImpl and (for the main context) CefBrowserMainParts. Only
+// accessed on the UI thread unless otherwise indicated. See browser_context.h
+// for an object relationship diagram.
 class CefBrowserContextImpl : public CefBrowserContext {
  public:
-  CefBrowserContextImpl();
+  explicit CefBrowserContextImpl(const CefRequestContextSettings& settings);
+
+  // Returns the existing instance, if any, associated with the specified
+  // |cache_path|.
+  static scoped_refptr<CefBrowserContextImpl> GetForCachePath(
+      const base::FilePath& cache_path);
+
+  // Must be called immediately after this object is created.
+  void Initialize();
 
   // BrowserContext methods.
   base::FilePath GetPath() const override;
@@ -50,6 +60,9 @@ class CefBrowserContextImpl : public CefBrowserContext {
   content::SSLHostStateDelegate* GetSSLHostStateDelegate() override;
 
   // CefBrowserContext methods.
+  bool IsProxy() const override;
+  const CefRequestContextSettings& GetSettings() const override;
+  CefRefPtr<CefRequestContextHandler> GetHandler() const override;
   net::URLRequestContextGetter* CreateRequestContext(
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors)
@@ -61,6 +74,11 @@ class CefBrowserContextImpl : public CefBrowserContext {
       content::URLRequestInterceptorScopedVector request_interceptors)
       override;
 
+  // Guaranteed to exist once this object has been initialized.
+  scoped_refptr<CefURLRequestContextGetterImpl> request_context() const {
+    return url_request_getter_;
+  }
+
  private:
   // Only allow deletion via scoped_refptr().
   friend struct content::BrowserThread::DeleteOnThread<
@@ -69,6 +87,12 @@ class CefBrowserContextImpl : public CefBrowserContext {
 
   ~CefBrowserContextImpl() override;
 
+  // Members initialized during construction are safe to access from any thread.
+  CefRequestContextSettings settings_;
+  base::FilePath cache_path_;
+
+  scoped_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
+
   scoped_ptr<CefDownloadManagerDelegate> download_manager_delegate_;
   scoped_refptr<CefURLRequestContextGetterImpl> url_request_getter_;