Finch experiment: auto-detect text encoding

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index f0b52156a097b64d3bc91f5541a8ebd9d36d913d..4139f1e6be9e451384a6056e339810459daafa64 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -323,6 +323,69 @@ private:
     WebColor m_color;
 };
 
+#if OS(ANDROID)
+// Array used to convert canonical encoding method name to index to be
+// uploaded to UMA for the experiment on text encoding auto detection.
+// The listed order should be in sync with the enum definition 'EncodingMethod'
+// in tools/metrics/histograms/histograms.xml.
+static const char* kEncodingNames[] = {
+    "UNKNOWN",
+    "Big5",
+    "EUC-JP",
+    "EUC-KR",
+    "GBK",
+    "IBM866",
+    "ISO-2022-JP",
+    "ISO-8859-10",
+    "ISO-8859-13",
+    "ISO-8859-14",
+    "ISO-8859-15",
+    "ISO-8859-16",
+    "ISO-8859-2",
+    "ISO-8859-3",
+    "ISO-8859-4",
+    "ISO-8859-5",
+    "ISO-8859-6",
+    "ISO-8859-7",
+    "ISO-8859-8",
+    "ISO-8859-8-I",
+    "KOI8-R",
+    "KOI8-U",
+    "Shift_JIS",
+    "UTF-16LE",
+    "UTF-8",
+    "gb18030",
+    "macintosh",
+    "windows-1250",
+    "windows-1251",
+    "windows-1252",
+    "windows-1253",
+    "windows-1254",
+    "windows-1255",
+    "windows-1256",
+    "windows-1257",
+    "windows-1258",
+    "windows-874"
+};
+
+// Returns the index of the entry in the array that matches
+// the given encoding method.
+static int encodingToUmaId(const WTF::TextEncoding& encoding)
+{
+    const char* encodingName = encoding.name();
+    for (size_t i = 0; i < WTF_ARRAY_LENGTH(kEncodingNames); ++i) {
+        if (!strcasecmp(kEncodingNames[i], encodingName))
+            return i;
+    }
+    return 0;
+}
+
+static bool isInternalURL(const KURL& url)
+{
+    const String& protocol = url.protocol();
+    return protocol == "chrome" || protocol == "chrome-native" || protocol == "swappedout";
+}
+#endif
 } // namespace
 
 // WebView ----------------------------------------------------------------
@@ -3927,6 +3990,18 @@ void WebViewImpl::didFinishDocumentLoad(WebLocalFrameImpl* webframe)
     if (webframe != mainFrameImpl())
         return;
     resumeTreeViewCommitsIfRenderingReady();
+#if OS(ANDROID)
+    if (!isInternalURL(webframe->frame()->document()->baseURL()) && page()->settings().usesEncodingDetector()) {
+        const Document& document = *webframe->frame()->document();
+
+        // "AutodetectEncoding.Attempted" is of boolean type - either 0 or 1. Use 2 for the boundary value.
+        Platform::current()->histogramEnumeration("AutodetectEncoding.Attempted", document.attemptedToDetermineEncodingFromContentSniffing(), 2);
+        if (document.encodingWasDetectedFromContentSniffing()) {
+            int encodingId = encodingToUmaId(document.encoding());
+            Platform::current()->histogramEnumeration("AutodetectEncoding.Detected", encodingId, WTF_ARRAY_LENGTH(kEncodingNames) + 1);
+        }
+    }
+#endif
 }
 
 void WebViewImpl::didRemoveAllPendingStylesheet(WebLocalFrameImpl* webframe)