From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <hop2deep@gmail.com>
Date: Thu, 20 Sep 2018 17:44:38 -0700
Subject: dcheck.patch

This disables some debug checks which currently fail when running the Electron
test suite. In general there should be sustained effort to have all debug checks
enabled. If you want to help, choose one of the diffs below and remove it. Then
build Electron (debug configuration) and make sure all tests pass on the CI
systems. Unfortunately the tests don't always cover the check failures, so it's
good to also run some non-trivial Electron app to verify.

Apart from getting rid of a whole diff, you may also be able to replace one diff
with another which enables at least some of the previously disabled checks. For
example, the checks might be disabled for a whole build target, but actually
only one or two specific checks fail. Then it's better to simply comment out the
failing checks and allow the rest of the target to have them enabled.

diff --git a/content/browser/frame_host/navigation_controller_impl.cc b/content/browser/frame_host/navigation_controller_impl.cc
index d8aca9e2cbffdfd0bbb0bd67e8adfb53547132bb..86224ab7a3c5637422559da25bc8c1040a03e937 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -995,8 +995,10 @@ NavigationType NavigationControllerImpl::ClassifyNavigation(
     return NAVIGATION_TYPE_NEW_SUBFRAME;
   }
 
-  // We only clear the session history when navigating to a new page.
-  DCHECK(!params.history_list_was_cleared);
+  // Electron does its own book keeping of navigation entries and we
+  // expect content to not track any, by clearing history list for
+  // all navigations.
+  // DCHECK(!params.history_list_was_cleared);
 
   if (rfh->GetParent()) {
     // All manual subframes would be did_create_new_entry and handled above, so
@@ -1233,7 +1235,10 @@ void NavigationControllerImpl::RendererDidNavigateToNewPage(
     new_entry->GetFavicon() = GetLastCommittedEntry()->GetFavicon();
   }
 
-  DCHECK(!params.history_list_was_cleared || !replace_entry);
+  // Electron does its own book keeping of navigation entries and we
+  // expect content to not track any, by clearing history list for
+  // all navigations.
+  // DCHECK(!params.history_list_was_cleared || !replace_entry);
   // The browser requested to clear the session history when it initiated the
   // navigation. Now we know that the renderer has updated its state accordingly
   // and it is safe to also clear the browser side history.
diff --git a/third_party/blink/renderer/platform/wtf/text/string_impl.h b/third_party/blink/renderer/platform/wtf/text/string_impl.h
index be183011e7f4e0af6f7676ac8a343ef36d2e7bc2..8b40c554912754b05d3bc5dc4889667f87935a0a 100644
--- a/third_party/blink/renderer/platform/wtf/text/string_impl.h
+++ b/third_party/blink/renderer/platform/wtf/text/string_impl.h
@@ -258,21 +258,21 @@ class WTF_EXPORT StringImpl {
   }
 
   ALWAYS_INLINE bool HasOneRef() const {
-#if DCHECK_IS_ON()
+#if 0
     DCHECK(IsStatic() || verifier_.IsSafeToUse()) << AsciiForDebugging();
 #endif
     return ref_count_ == 1;
   }
 
   ALWAYS_INLINE void AddRef() const {
-#if DCHECK_IS_ON()
+#if 0
     DCHECK(IsStatic() || verifier_.OnRef(ref_count_)) << AsciiForDebugging();
 #endif
     ++ref_count_;
   }
 
   ALWAYS_INLINE void Release() const {
-#if DCHECK_IS_ON()
+#if 0
     DCHECK(IsStatic() || verifier_.OnDeref(ref_count_))
         << AsciiForDebugging() << " " << CurrentThread();
 #endif
diff --git a/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index e49dd8c81270cdd9794ddee11bad036c2f444af5..9e61c901cd2df168520b83a8522ca8c032f4c0ae 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -905,9 +905,9 @@ void ClipboardWin::WriteBitmapFromHandle(HBITMAP source_hbitmap,
 }
 
 void ClipboardWin::WriteToClipboard(unsigned int format, HANDLE handle) {
-  DCHECK(clipboard_owner_->hwnd() != NULL);
+  // DCHECK(clipboard_owner_->hwnd() != NULL);
   if (handle && !::SetClipboardData(format, handle)) {
-    DCHECK(ERROR_CLIPBOARD_NOT_OPEN != GetLastError());
+    // DCHECK(ERROR_CLIPBOARD_NOT_OPEN != GetLastError());
     FreeData(format, handle);
   }
 }