Add chrome runtime support for more callbacks and ceftests (see issue #2969)

This change adds support for:
- Protocol and request handling.
- Loading and navigation events.
- Display and focus events.
- Mouse/keyboard events.
- Popup browsers.
- Callbacks in the renderer process.
- Misc. functionality required for ceftests.

This change also adds a new CefBrowserProcessHandler::GetCookieableSchemes
callback for configuring global state that will be applied to all
CefCookieManagers by default. This global callback is currently required by the
chrome runtime because the primary ProfileImpl is created via
ChromeBrowserMainParts::PreMainMessageLoopRun (CreatePrimaryProfile) before
OnContextCreated can be called.

ProfileImpl will use the "C:\Users\[user]\AppData\Local\CEF\User Data\Default"
directory by default (on Windows). Cookies may persist in this directory when
running ceftests and may need to be manually deleted if those tests fail.

Remaining work includes:
- Support for client-created request contexts.
- Embedding the browser in a Views hierarchy (cefclient support).
- TryCloseBrowser and DoClose support.
- Most of the CefSettings configuration.
- DevTools protocol and window control (ShowDevTools, ExecuteDevToolsMethod).
- CEF-specific WebUI pages (about, license, webui-hosts).
- Context menu customization (CefContextMenuHandler).
- Auto resize (SetAutoResizeEnabled).
- Zoom settings (SetZoomLevel).
- File dialog runner (RunFileDialog).
- File and JS dialog handlers (CefDialogHandler, CefJSDialogHandler).
- Extension loading (LoadExtension, etc).
- Plugin loading (OnBeforePluginLoad).
- Widevine loading (CefRegisterWidevineCdm).
- PDF and print preview does not display.
- Crash reporting is untested.
- Mac: Web content loads but does not display.

The following ceftests are now passing when run with the
"--enable-chrome-runtime" command-line flag:

CorsTest.*
DisplayTest.*:-DisplayTest.AutoResize
DOMTest.*
DraggableRegionsTest.*
ImageTest.*
MessageRouterTest.*
NavigationTest.*
ParserTest.*
RequestContextTest.*Global*
RequestTest.*
ResourceManagerTest.*
ResourceRequestHandlerTest.*
ResponseTest.*
SchemeHandlerTest.*
ServerTest.*
StreamResourceHandlerTest.*
StreamTest.*
StringTest.*
TaskTest.*
TestServerTest.*
ThreadTest.*
URLRequestTest.*Global*
V8Test.*:-V8Test.OnUncaughtExceptionDevTools
ValuesTest.*
WaitableEventTest.*
XmlReaderTest.*
ZipReaderTest.*

libcef/browser/net_service/cookie_manager_impl.cc

@@ -4,11 +4,13 @@
 
 #include "libcef/browser/net_service/cookie_manager_impl.h"
 
+#include "libcef/common/app_manager.h"
 #include "libcef/common/net_service/net_service_util.h"
 #include "libcef/common/time_util.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/no_destructor.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/storage_partition.h"
 #include "services/network/public/mojom/cookie_manager.mojom.h"
@@ -115,6 +117,25 @@ void GetCookiesCallbackImpl(
   GetAllCookiesCallbackImpl(visitor, browser_context_getter, cookies);
 }
 
+CefCookieManagerImpl::CookieableSchemes MakeSupportedSchemes(
+    const std::vector<CefString>& schemes,
+    bool include_defaults) {
+  std::vector<std::string> all_schemes;
+  for (const auto& scheme : schemes)
+    all_schemes.push_back(scheme);
+
+  if (include_defaults) {
+    // Add default schemes that should always support cookies.
+    // This list should match CookieMonster::kDefaultCookieableSchemes.
+    all_schemes.push_back("http");
+    all_schemes.push_back("https");
+    all_schemes.push_back("ws");
+    all_schemes.push_back("wss");
+  }
+
+  return base::make_optional(all_schemes);
+}
+
 }  // namespace
 
 CefCookieManagerImpl::CefCookieManagerImpl() {}
@@ -140,19 +161,6 @@ void CefCookieManagerImpl::SetSupportedSchemes(
     return;
   }
 
-  std::vector<std::string> all_schemes;
-  for (const auto& scheme : schemes)
-    all_schemes.push_back(scheme);
-
-  if (include_defaults) {
-    // Add default schemes that should always support cookies.
-    // This list should match CookieMonster::kDefaultCookieableSchemes.
-    all_schemes.push_back("http");
-    all_schemes.push_back("https");
-    all_schemes.push_back("ws");
-    all_schemes.push_back("wss");
-  }
-
   auto browser_context = GetBrowserContext(browser_context_getter_);
   if (!browser_context)
     return;
@@ -160,7 +168,8 @@ void CefCookieManagerImpl::SetSupportedSchemes(
   // This will be forwarded to the CookieMonster that lives in the
   // NetworkService process when the NetworkContext is created via
   // AlloyContentBrowserClient::CreateNetworkContext.
-  browser_context->set_cookieable_schemes(base::make_optional(all_schemes));
+  browser_context->set_cookieable_schemes(
+      MakeSupportedSchemes(schemes, include_defaults));
   RunAsyncCompletionOnUIThread(callback);
 }
 
@@ -343,6 +352,26 @@ bool CefCookieManagerImpl::FlushStore(
   return true;
 }
 
+// static
+CefCookieManagerImpl::CookieableSchemes
+CefCookieManagerImpl::GetGlobalCookieableSchemes() {
+  CEF_REQUIRE_UIT();
+
+  static base::NoDestructor<CookieableSchemes> schemes(
+      []() -> CefCookieManagerImpl::CookieableSchemes {
+        if (auto application = CefAppManager::Get()->GetApplication()) {
+          if (auto handler = application->GetBrowserProcessHandler()) {
+            std::vector<CefString> schemes;
+            bool include_defaults = true;
+            handler->GetCookieableSchemes(schemes, include_defaults);
+            return MakeSupportedSchemes(schemes, include_defaults);
+          }
+        }
+        return base::nullopt;
+      }());
+  return *schemes;
+}
+
 // CefCookieManager methods ----------------------------------------------------
 
 // static