PlzNavigate: make MHTML iframe load working.

third_party/WebKit/Source/web/LocalFrameClientImpl.cpp

Index: third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
index 35672e3b98eb0cb87949f29fafccae7c2958eebf..95487a64b413dba02db0445a1c642707036b718d 100644
--- a/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
+++ b/third_party/WebKit/Source/web/LocalFrameClientImpl.cpp
@@ -76,6 +76,7 @@
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/exported/WrappedResourceResponse.h"
 #include "platform/feature_policy/FeaturePolicy.h"
+#include "platform/loader/fetch/ResourceFetcher.h"
 #include "platform/network/HTTPParsers.h"
 #include "platform/network/mime/MIMETypeRegistry.h"
 #include "platform/plugins/PluginData.h"
@@ -514,6 +515,12 @@ NavigationPolicy LocalFrameClientImpl::DecidePolicyForNavigation(
               kCheckContentSecurityPolicy
           ? kWebContentSecurityPolicyDispositionCheck
           : kWebContentSecurityPolicyDispositionDoNotCheck;
+
+  if (IsLoadedAsMHTMLArchive()) {
+    navigation_info.archive_status =
+        WebFrameClient::NavigationPolicyInfo::ArchiveStatus::Present;
+  }
+
   // Caching could be disabled for requests initiated by DevTools.
   // TODO(ananta)
   // We should extract the network cache state into a global component which
@@ -980,6 +987,26 @@ WebDevToolsAgentImpl* LocalFrameClientImpl::DevToolsAgent() {
       ->DevToolsAgentImpl();
 }
 
+bool LocalFrameClientImpl::IsLoadedAsMHTMLArchive() const {
+  WebFrame* parent_frame = web_frame_->Parent();
+  if (!parent_frame)
+    return false;
+
+  // TODO(nasko): How should this work with OOPIF?
+  // The MHTMLArchive is parsed as a whole, but can be constructed from frames
+  // in multiple processes. In that case, which process should parse it and how
+  // should the output be spread back across multiple processes?
+  if (!parent_frame->IsWebLocalFrame())
+    return false;
+
+  return ToWebLocalFrameImpl(parent_frame)
+      ->GetFrame()
+      ->Loader()
+      .GetDocumentLoader()
+      ->Fetcher()
+      ->Archive();
+}
+
 KURL LocalFrameClientImpl::OverrideFlashEmbedWithHTML(const KURL& url) {
   return web_frame_->Client()->OverrideFlashEmbedWithHTML(WebURL(url));
 }