Adds enableVirtualTime and setVirtualTimePolicy To Emulation domain.

third_party/WebKit/Source/platform/WebViewScheduler.cpp

Index: third_party/WebKit/Source/platform/WebViewScheduler.cpp
diff --git a/third_party/WebKit/Source/platform/WebViewScheduler.cpp b/third_party/WebKit/Source/platform/WebViewScheduler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..022a8040bba3ba6893c56bfd69bd4451a435840c
--- /dev/null
+++ b/third_party/WebKit/Source/platform/WebViewScheduler.cpp
@@ -0,0 +1,72 @@
+// Copyright 2016 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 "public/platform/WebViewScheduler.h"
+
+#include "wtf/StdLibExtras.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+WebViewScheduler::WebViewScheduler()
+    : m_pendingResourceLoadCount(0)
+    , m_virtualTimePolicy(VirtualTimePolicy::ADVANCE) { }
+
+void WebViewScheduler::incrementPendingResorceLoadCount()
+{
+    m_pendingResourceLoadCount++;
+
+    if (m_virtualTimePolicy != VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING)
+        return;
+
+    if (m_pendingResourceLoadCount == 1)
+        setAllowVirtualTimeToAdvance(false);
+}
+
+void WebViewScheduler::decrementPendingResorceLoadCount()
+{
+    m_pendingResourceLoadCount--;

[Sami, 2016/06/29 16:22:27]

DCHECK >= 0?

[alex clarke (OOO till 29th), 2016/06/29 17:08:31]

Done.

+
+    if (m_virtualTimePolicy != VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING)
+        return;
+
+    if (m_pendingResourceLoadCount == 0)
+        setAllowVirtualTimeToAdvance(true);
+}
+
+void WebViewScheduler::setVirtualTimePolicy(VirtualTimePolicy policy)
+{
+    m_virtualTimePolicy = policy;
+
+    switch (m_virtualTimePolicy) {
+    case VirtualTimePolicy::ADVANCE:
+        setAllowVirtualTimeToAdvance(true);
+        break;
+
+    case VirtualTimePolicy::PAUSE:
+        setAllowVirtualTimeToAdvance(false);
+        break;
+
+    case VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING:
+        setAllowVirtualTimeToAdvance(m_pendingResourceLoadCount == 0);
+        break;
+    }
+}
+
+void WebViewScheduler::setVirtualTimePolicy(const String& policy)
+{
+    DEFINE_STATIC_LOCAL(String, advance, ("advance"));
+    DEFINE_STATIC_LOCAL(String, pause, ("pause"));
+    DEFINE_STATIC_LOCAL(String, pauseIfNetworkFetchesPending, ("pauseIfNetworkFetchesPending"));
+
+    if (policy == advance) {
+        setVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+    } else if (policy == pause) {
+        setVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+    } else if (policy == pauseIfNetworkFetchesPending) {
+        setVirtualTimePolicy(VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING);
+    }
+}
+
+} // namespace blink