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 954d5401b71bb090c1c533783398298f28eeefbd..dd9051afe099cb1ef3aebb825cf05c347b4abbf4 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -1271,8 +1271,10 @@ 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
@@ -1528,7 +1530,10 @@ 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/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index b422119ff36713399358b27aff8b18423f79d954..5c223f360ca641a3e29f23e6d409d7f97414a985 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -831,10 +831,10 @@ SkBitmap ClipboardWin::ReadImageInternal(ClipboardBuffer buffer) const {
 
 void ClipboardWin::WriteToClipboard(ClipboardFormatType format, HANDLE handle) {
   UINT cf_format = format.ToFormatEtc().cfFormat;
-  DCHECK_NE(clipboard_owner_->hwnd(), nullptr);
+  // DCHECK_NE(clipboard_owner_->hwnd(), nullptr);
   if (handle && !::SetClipboardData(cf_format, handle)) {
-    DCHECK_NE(GetLastError(),
-              static_cast<unsigned long>(ERROR_CLIPBOARD_NOT_OPEN));
+    // DCHECK_NE(GetLastError(),
+              // static_cast<unsigned long>(ERROR_CLIPBOARD_NOT_OPEN));
     FreeData(cf_format, handle);
   }
 }