Add deprecation message for -webkit-background-composite

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

Index: third_party/WebKit/Source/core/frame/DeprecationHelper.cpp
diff --git a/third_party/WebKit/Source/core/frame/DeprecationHelper.cpp b/third_party/WebKit/Source/core/frame/DeprecationHelper.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dcc651845234e4a9cbfe3cf8d1b4e9aac0954953
--- /dev/null
+++ b/third_party/WebKit/Source/core/frame/DeprecationHelper.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2016 Google, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core/frame/DeprecationHelper.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 {
+
+DeprecationHelper::DeprecationHelper()
+{
+    m_CSSPropertyDeprecationBits.ensureSize(lastUnresolvedCSSProperty + 1);
+    m_CSSPropertyDeprecationBits.clearAll();
+}
+
+DeprecationHelper::~DeprecationHelper()
+{
+    m_CSSPropertyDeprecationBits.clearAll();
+}
+
+void DeprecationHelper::showDeprecationWarning(const LocalFrame* frame, CSSPropertyID propertyID)
+{
+    if (!frame)
+        return;
+    FrameHost* host = frame->host();
+    if (!host)
+        return;
+
+    String message = deprecationMessage(propertyID);
+    if (!host->deprecationHelper().isCounted(propertyID) && !message.isEmpty()) {
+        host->deprecationHelper().count(propertyID);
+        frame->console().addMessage(ConsoleMessage::create(DeprecationMessageSource, WarningMessageLevel, message));
+    }
+}
+
+const char* milestoneString(int milestone)
+{
+    switch (milestone) {
+    case 50:
+        return "M50, around April 2016";
+    case 51:
+        return "M51, around June 2016";
+    case 53:
+        return "M53, around September 2016";
+    }
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+String willBeRemoved(const char* feature, int milestone, const char* details)
+{
+    return String::format("%s is deprecated and will be removed in %s. See https://www.chromestatus.com/features/%s for more details.", feature, milestoneString(milestone), details);
+}

[alancutter (OOO until 2018), 2016/01/21 00:58:38]

Don't copy paste this, expose it as a static method on UseCounter with a TODO to
migrate all console message functions to this class.

[nainar, 2016/01/21 02:39:06]

Done.

+
+String DeprecationHelper::deprecationMessage(CSSPropertyID cssPropertyID)
+{
+    switch (cssPropertyID) {
+    case CSSPropertyWebkitBackgroundComposite:
+        return willBeRemoved("'-webkit-background-composite'", 51, "6607299456008192");
+    default:
+        return emptyString();
+    }
+}
+
+} // namespace blink