Add deprecation message for -webkit-background-composite

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4d98668002936e55c45df4b75eb4298c07b50c80
--- /dev/null
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -0,0 +1,63 @@
+// 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 "core/frame/Deprecation.h"
+
+#include "core/frame/FrameConsole.h"
+#include "core/frame/FrameHost.h"
+#include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
+#include "core/inspector/ConsoleMessage.h"
+
+namespace blink {
+
+Deprecation::Deprecation()
+{
+    m_cssPropertyDeprecationBits.ensureSize(lastUnresolvedCSSProperty + 1);
+    m_cssPropertyDeprecationBits.clearAll();
+}
+
+Deprecation::~Deprecation()
+{
+    m_cssPropertyDeprecationBits.clearAll();
+}
+
+void Deprecation::suppress(CSSPropertyID propertyID)

[Timothy Loh, 2016/01/25 04:48:41]

propertyID -> unresolvedProperty everywhere

[nainar, 2016/01/25 05:33:22]

Done

+{
+    ASSERT(propertyID >= firstCSSProperty);
+    ASSERT(propertyID <= lastUnresolvedCSSProperty);
+    m_cssPropertyDeprecationBits.quickSet(propertyID);
+}
+bool Deprecation::isSuppressed(CSSPropertyID propertyID)
+{
+    ASSERT(propertyID >= firstCSSProperty);
+    ASSERT(propertyID <= lastUnresolvedCSSProperty);
+    return m_cssPropertyDeprecationBits.quickGet(propertyID);
+}
+
+void Deprecation::showConsoleWarning(const LocalFrame* frame, CSSPropertyID propertyID)
+{
+    FrameHost* host = frame ? frame->host() : nullptr;
+    if (!host || host->deprecation().isSuppressed(propertyID)) {
+        return;
+    }
+
+    String message = deprecationMessage(propertyID);
+    if (!message.isEmpty()) {
+        host->deprecation().suppress(propertyID);
+        frame->console().addMessage(ConsoleMessage::create(DeprecationMessageSource, WarningMessageLevel, message));
+    }
+}
+
+String Deprecation::deprecationMessage(CSSPropertyID cssPropertyID)
+{
+    switch (cssPropertyID) {
+    case CSSPropertyWebkitBackgroundComposite:
+        return UseCounter::willBeRemoved("'-webkit-background-composite'", 51, "6607299456008192");
+    default:
+        return emptyString();
+    }
+}
+
+} // namespace blink