Collect host of Web Component usage to send to RAPPOR

Source/core/frame/UseByOriginCounter.cpp

Index: Source/core/frame/UseByOriginCounter.cpp
diff --git a/Source/core/frame/UseByOriginCounter.cpp b/Source/core/frame/UseByOriginCounter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2f4e44973e112e611e016116a1601e07428695fa
--- /dev/null
+++ b/Source/core/frame/UseByOriginCounter.cpp
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+/*

[bashi, 2015/03/09 23:42:31]

nit: Use the 3-line license header.

[kojii, 2015/03/10 05:06:16]

Done, thank you, I missed that.

+ * Copyright (C) 2015 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 "config.h"
+#include "core/frame/UseByOriginCounter.h"
+
+#include "bindings/core/v8/ScriptState.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/UseCounter.h"
+
+namespace blink {
+
+UseByOriginCounter::Value::Value()
+    : m_countBits(0)
+{
+}
+
+void UseByOriginCounter::count(const ScriptState* scriptState, Document& document, Feature feature)
+{
+    if (!scriptState || !scriptState->world().isMainWorld())
+        return;
+    document.useByOriginCounterValue().count(feature);
+}
+
+void UseByOriginCounter::Value::count(Feature feature)
+{
+    ASSERT((unsigned)feature >= 0 && feature < Feature::NumberOfFeatures);
+    m_countBits |= 1 << (unsigned)feature;
+}
+
+void UseByOriginCounter::documentDetached(Document& document)
+{
+    UseByOriginCounter::Value counter = document.useByOriginCounterValue();
+    if (counter.isEmpty())
+        return;
+    const KURL& url = document.url();
+    if (!url.protocolIsInHTTPFamily())
+        return;
+    m_originAndValues.append(std::make_pair(url.host(), counter));
+    document.useByOriginCounterValue().clear();
+    ASSERT(document.useByOriginCounterValue().isEmpty());
+}
+
+void UseByOriginCounter::updateMeasurementsAndClear()
+{
+    if (m_originAndValues.isEmpty())
+        return;
+
+    // Aggregate values by origins.
+    HashMap<String, UseByOriginCounter::Value> aggregatedByOrigin;
+    for (std::pair<String, UseByOriginCounter::Value>& originAndValue : m_originAndValues) {
+        ASSERT(!originAndValue.first.isEmpty());
+        auto result = aggregatedByOrigin.add(originAndValue.first, originAndValue.second);
+        if (!result.isNewEntry)
+            result.storedValue->value.aggregate(originAndValue.second);
+    }
+
+    // FIXME: Reporting to RAPPOR is not implemented yet.
+    // for (auto& counter : aggregatedByOrigin) {
+    // }
+
+    m_originAndValues.clear();
+}
+
+void UseByOriginCounter::Value::aggregate(UseByOriginCounter::Value other)
+{
+    m_countBits |= other.m_countBits;
+}
+
+} // namespace blink