Feature/cef speedup (#806)

* Improve cmake errors
  * Calling doMessageLoopWork more often to increase gui performance
  * Introduce frequent callbacks
  * Restructure browser update callbacks
  * Cleanup cef speedup
  * Add flag to toggle updating browser between renderable calls
  * CEF should not be used in single process mode
  * Update CEF version
  * Postbuild step for finding framework from web helper
  * Load libcef dynamically to fix issue with CEF update
  * Only include dynamic library loader on mac
  * Improve keyboard mapping support on MacOS
  * Add arrow keys
  * Rename manifest
  * Fix bug with missing blinking cursor in text fields
  * Bump minimum cmake version
  * CEF fixes: Runtime and correct helper path
  * Be true to actual sandbox compatibility specified by CEF
  * Cleanup

modules/webbrowser/src/processhelpermac.cpp

@@ -28,9 +28,33 @@
 
 #include "include/cef_app.h"
 #include "include/webbrowserapp.h"
+#include "include/wrapper/cef_library_loader.h"
+
+// When generating projects with CMake the CEF_USE_SANDBOX value will be defined
+// automatically. Pass -DUSE_SANDBOX=OFF to the CMake command-line to disable
+// use of the sandbox.
+#if defined(CEF_USE_SANDBOX)
+#include "include/cef_sandbox_mac.h"
+#endif
 
 // Entry point function for sub-processes.
 int main(int argc, char* argv[]) {
+
+#if defined(CEF_USE_SANDBOX)
+    // Initialize the macOS sandbox for this helper process.
+    CefScopedSandboxContext sandbox_context;
+    if (!sandbox_context.Initialize(argc, argv)) {
+        return 1;
+    }
+#endif
+
+    // Load the CEF framework library at runtime instead of linking directly
+    // as required by the macOS sandbox implementation.
+    CefScopedLibraryLoader library_loader;
+    if (!library_loader.LoadInHelper()) {
+        return 1;
+    }
+
     // Provide CEF with command-line arguments.
     CefMainArgs main_args(argc, argv);