Not for review - Rebase of crrev.com/62833003

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index e0dc3d4a161022e66c4d64f23bd76028a73f8671..4f1f55c5138b9ea8dfee3969d5bfc9a7ea411156 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -58,6 +58,7 @@
 #include "platform/FileChooser.h"
 #include "platform/PlatformScreen.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/TraceEvent.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
@@ -707,6 +708,16 @@ void ChromeClientImpl::exitFullScreenForElement(Element* element)
     m_webView->exitFullScreenForElement(element);
 }
 
+int ChromeClientImpl::compositorId() const
+{
+    if (WebViewClient* client = m_webView->client()) {
+        int id = client->compositorId();
+        TRACE_EVENT1("teleport", "ChromeClientImpl::compositorId", "id", id);
+        return id;
+    }
+    return 0;
+}
+
 void ChromeClientImpl::clearCompositedSelectionBounds()
 {
     m_webView->clearCompositedSelectionBounds();