Update to Chromium version 88.0.4324.0 (#827102)

- Mac: Xcode 12.2 and the MacOS 11.0 SDK are now required for building.
- MacOS 10.10 (Yosemite) is no longer supported (see https://crbug.com/1126056).
- Flash is no longer supported (see https://www.chromium.org/flash-roadmap).

libcef/renderer/blink_glue.h

@@ -24,6 +24,10 @@ class WebNode;
 class WebString;
 class WebURLResponse;
 class WebView;
+
+namespace scheduler {
+class WebResourceLoadingTaskRunnerHandle;
+}
 }  // namespace blink
 
 namespace blink_glue {
@@ -89,6 +93,15 @@ BLINK_EXPORT bool ResponseWasCached(const blink::WebURLResponse& response);
 // Returns true if the frame owner is a plugin.
 BLINK_EXPORT bool HasPluginFrameOwner(blink::WebLocalFrame* frame);
 
+// Used by CefFrameImpl::CreateURLLoader.
+BLINK_EXPORT
+std::unique_ptr<blink::scheduler::WebResourceLoadingTaskRunnerHandle>
+CreateResourceLoadingTaskRunnerHandle(blink::WebLocalFrame* frame);
+BLINK_EXPORT
+std::unique_ptr<blink::scheduler::WebResourceLoadingTaskRunnerHandle>
+CreateResourceLoadingMaybeUnfreezableTaskRunnerHandle(
+    blink::WebLocalFrame* frame);
+
 }  // namespace blink_glue
 
 #endif  // CEF_LIBCEF_RENDERER_BLINK_GLUE_H_