WebViewTestProxyBase: clear out main test delegate upon destruction.

content/shell/test_runner/web_view_test_proxy.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/test_runner/web_view_test_proxy.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "content/shell/test_runner/accessibility_controller.h"
@@ skipping 14 matching lines @@
       delegate_(nullptr),
       web_view_(nullptr),
       accessibility_controller_(new AccessibilityController(this)),
       text_input_controller_(new TextInputController(this)),
       view_test_runner_(new TestRunnerForSpecificView(this)) {
   WebWidgetTestProxyBase::set_web_view_test_proxy_base(this);
 }
 
 WebViewTestProxyBase::~WebViewTestProxyBase() {
   test_interfaces_->WindowClosed(this);
+  if (test_interfaces_->GetDelegate() == delegate_)
+    test_interfaces_->SetDelegate(nullptr);

[tasak, 2017/03/07 03:06:01]

I think, this breaks "--single-process".

Received signal 6
#0 0x7f2824a7939c base::debug::StackTrace::StackTrace()
#1 0x7f2824a78f01 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f28247aa330 <unknown>
#3 0x7f281cdb4c37 gsignal
#4 0x7f281cdb8028 abort
#5 0x7f2824a76c75 base::debug::BreakDebugger()
#6 0x7f2824a966c6 logging::LogMessage::~LogMessage()
#7 0x7f28202c9546 test_runner::GamepadController::Create()
#8 0x7f28202dd39c test_runner::TestInterfaces::SetDelegate()
#9 0x7f282030fe60 test_runner::WebViewTestProxyBase::~WebViewTestProxyBase()
#10 0x000000565b55
_ZN11test_runner16WebViewTestProxyIN7content14RenderViewImplEJPNS1_22CompositorDependenciesERKNS1_5mojom16CreateViewParamsEEED0Ev
#11 0x7f2823d2843d
_ZN4base8internal9BindStateIMN7content12RenderWidgetEFvvEJ13scoped_refptrIS3_EEE7DestroyEPKNS0_13BindStateBaseE
#12 0x7f2824a79eff base::debug::TaskAnnotator::RunTask()


SetDelegate(nullptr) invokes test_runner::GamepadController::Create(nullptr).

 }
 
 void WebViewTestProxyBase::SetInterfaces(WebTestInterfaces* interfaces) {
   test_interfaces_ = interfaces->GetTestInterfaces();
   test_interfaces_->WindowOpened(this);
 }
 
 void WebViewTestProxyBase::Reset() {
   accessibility_controller_->Reset();
   // text_input_controller_ doesn't have any state to reset.
   view_test_runner_->Reset();
   WebWidgetTestProxyBase::Reset();
 
   for (blink::WebFrame* frame = web_view_->mainFrame(); frame;
        frame = frame->traverseNext()) {
     if (frame->isWebLocalFrame())
       delegate_->GetWebWidgetTestProxyBase(frame->toWebLocalFrame())->Reset();
   }
 }
 
 void WebViewTestProxyBase::BindTo(blink::WebLocalFrame* frame) {
   accessibility_controller_->Install(frame);
   text_input_controller_->Install(frame);
   view_test_runner_->Install(frame);
 }
 
 }  // namespace test_runner