Move DOM-inspecting language detection logic to Blink.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 761030a44632019f341991fa3a1bbe0373d56a4e..790e76389330a0524c44673e015150cf33c1726f 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -97,6 +97,7 @@
 #include "bindings/core/v8/V8PerIsolateData.h"
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
+#include "core/dom/DocumentStatisticsCollector.h"
 #include "core/dom/IconURL.h"
 #include "core/dom/MessagePort.h"
 #include "core/dom/Node.h"
@@ -246,64 +247,6 @@ namespace blink {
 
 static int frameCount = 0;
 
-static void frameContentAsPlainText(size_t maxChars, LocalFrame* frame, StringBuilder& output)
-{
-    Document* document = frame->document();
-    if (!document)
-        return;
-
-    if (!frame->view())
-        return;
-
-    // Select the document body.
-    if (document->body()) {
-        const EphemeralRange range = EphemeralRange::rangeOfContents(*document->body());
-
-        // The text iterator will walk nodes giving us text. This is similar to
-        // the plainText() function in core/editing/TextIterator.h, but we implement the maximum
-        // size and also copy the results directly into a wstring, avoiding the
-        // string conversion.
-        for (TextIterator it(range.startPosition(), range.endPosition()); !it.atEnd(); it.advance()) {
-            it.text().appendTextToStringBuilder(output, 0, maxChars - output.length());
-            if (output.length() >= maxChars)
-                return; // Filled up the buffer.
-        }
-    }
-
-    // The separator between frames when the frames are converted to plain text.
-    const LChar frameSeparator[] = { '\n', '\n' };
-    const size_t frameSeparatorLength = WTF_ARRAY_LENGTH(frameSeparator);
-
-    // Recursively walk the children.
-    const FrameTree& frameTree = frame->tree();
-    for (Frame* curChild = frameTree.firstChild(); curChild; curChild = curChild->tree().nextSibling()) {
-        if (!curChild->isLocalFrame())
-            continue;
-        LocalFrame* curLocalChild = toLocalFrame(curChild);
-        // Ignore the text of non-visible frames.
-        LayoutView* contentLayoutObject = curLocalChild->contentLayoutObject();
-        LayoutPart* ownerLayoutObject = curLocalChild->ownerLayoutObject();
-        if (!contentLayoutObject || !contentLayoutObject->size().width() || !contentLayoutObject->size().height()
-            || (contentLayoutObject->location().x() + contentLayoutObject->size().width() <= 0) || (contentLayoutObject->location().y() + contentLayoutObject->size().height() <= 0)
-            || (ownerLayoutObject && ownerLayoutObject->style() && ownerLayoutObject->style()->visibility() != VISIBLE)) {
-            continue;
-        }
-
-        // Make sure the frame separator won't fill up the buffer, and give up if
-        // it will. The danger is if the separator will make the buffer longer than
-        // maxChars. This will cause the computation above:
-        //   maxChars - output->size()
-        // to be a negative number which will crash when the subframe is added.
-        if (output.length() >= maxChars - frameSeparatorLength)
-            return;
-
-        output.append(frameSeparator, frameSeparatorLength);
-        frameContentAsPlainText(maxChars, curLocalChild, output);
-        if (output.length() >= maxChars)
-            return; // Filled up the buffer.
-    }
-}
-
 static WillBeHeapVector<ScriptSourceCode> createSourcesVector(const WebScriptSource* sourcesIn, unsigned numSources)
 {
     WillBeHeapVector<ScriptSourceCode> sources;
@@ -1459,7 +1402,7 @@ WebString WebLocalFrameImpl::contentAsText(size_t maxChars) const
     if (!frame())
         return WebString();
     StringBuilder text;
-    frameContentAsPlainText(maxChars, frame(), text);
+    DocumentStatisticsCollector::frameTreeContentAsPlainText(maxChars, frame(), text);
     return text.toString();
 }