Introduce use counters for Blink specific CSS classes for editing

This patch introduces Blink specific CSS classes for editing for
  - Apple-interchange-newline
  - Apple-converted-space
  - Apple-paste-as-quotation
  - Apple-style-span
  - Apple-tab-span
These CSS classes are defined in "core/editing/HTMLInterchange.h"

We would like to deprecate these Blink specific CSS classes for browser
compatibility, if possible.

BUG=383677
TEST=n/a

Review URL: https://codereview.chromium.org/327323005

git-svn-id: svn://svn.chromium.org/blink/trunk@176171 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/editing/ApplyStyleCommand.cpp

@@ -43,6 +43,7 @@
 #include "core/editing/TextIterator.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
+#include "core/frame/UseCounter.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderText.h"
 #include "platform/heap/Handle.h"
@@ -65,7 +66,10 @@ bool isLegacyAppleStyleSpan(const Node *node)
         return false;
 
     const HTMLElement* elem = toHTMLElement(node);
-    return elem->hasLocalName(spanAttr) && elem->getAttribute(classAttr) == styleSpanClassString();
+    if (!elem->hasLocalName(spanAttr) || elem->getAttribute(classAttr) != styleSpanClassString())
+        return false;
+    UseCounter::count(elem->document(), UseCounter::EditingAppleStyleSpanClass);
+    return true;
 }
 
 static bool hasNoAttributeOrOnlyStyleAttribute(const Element* element, ShouldStyleAttributeBeEmpty shouldStyleAttributeBeEmpty)

third_party/WebKit/Source/core/editing/ReplaceSelectionCommand.cpp

@@ -48,6 +48,7 @@
 #include "core/editing/markup.h"
 #include "core/events/BeforeTextInsertedEvent.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/rendering/RenderObject.h"
@@ -97,13 +98,19 @@ private:
 static bool isInterchangeNewlineNode(const Node *node)
 {
     DEFINE_STATIC_LOCAL(String, interchangeNewlineClassString, (AppleInterchangeNewline));
-    return isHTMLBRElement(node) && toElement(node)->getAttribute(classAttr) == interchangeNewlineClassString;
+    if (!isHTMLBRElement(node) || toElement(node)->getAttribute(classAttr) != interchangeNewlineClassString)
+        return false;
+    UseCounter::count(node->document(), UseCounter::EditingAppleInterchangeNewline);
+    return true;
 }
 
 static bool isInterchangeConvertedSpaceSpan(const Node *node)
 {
     DEFINE_STATIC_LOCAL(String, convertedSpaceSpanClassString, (AppleConvertedSpace));
-    return node->isHTMLElement() && toHTMLElement(node)->getAttribute(classAttr) == convertedSpaceSpanClassString;
+    if (!node->isHTMLElement() || toHTMLElement(node)->getAttribute(classAttr) != convertedSpaceSpanClassString)
+        return false;
+    UseCounter::count(node->document(), UseCounter::EditingAppleConvertedSpace);
+    return true;
 }
 
 static Position positionAvoidingPrecedingNodes(Position pos)
@@ -418,7 +425,10 @@ bool ReplaceSelectionCommand::shouldMergeEnd(bool selectionEndWasEndOfParagraph)
 
 static bool isMailPasteAsQuotationNode(const Node* node)
 {
-    return node && node->hasTagName(blockquoteTag) && toElement(node)->getAttribute(classAttr) == ApplePasteAsQuotation;
+    if (!node || !node->hasTagName(blockquoteTag) || toElement(node)->getAttribute(classAttr) != ApplePasteAsQuotation)
+        return false;
+    UseCounter::count(node->document(), UseCounter::EditingApplePasteAsQuotation);
+    return true;
 }
 
 static bool isHeaderElement(const Node* a)
@@ -866,10 +876,18 @@ static bool isInlineNodeWithStyle(const Node* node)
     // one of our internal classes.
     const HTMLElement* element = toHTMLElement(node);
     const AtomicString& classAttributeValue = element->getAttribute(classAttr);
-    if (classAttributeValue == AppleTabSpanClass
-        || classAttributeValue == AppleConvertedSpace
-        || classAttributeValue == ApplePasteAsQuotation)
+    if (classAttributeValue == AppleTabSpanClass) {
+        UseCounter::count(node->document(), UseCounter::EditingAppleTabSpanClass);
         return true;
+    }
+    if (classAttributeValue == AppleConvertedSpace) {
+        UseCounter::count(node->document(), UseCounter::EditingAppleConvertedSpace);
+        return true;
+    }
+    if (classAttributeValue == ApplePasteAsQuotation) {
+        UseCounter::count(node->document(), UseCounter::EditingApplePasteAsQuotation);
+        return true;
+    }
 
     return EditingStyle::elementIsStyledSpanOrHTMLEquivalent(element);
 }

third_party/WebKit/Source/core/editing/htmlediting.cpp

@@ -44,6 +44,7 @@
 #include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLLIElement.h"
@@ -824,7 +825,10 @@ PassRefPtrWillBeRawPtr<HTMLElement> createHTMLElement(Document& document, const
 
 bool isTabSpanNode(const Node* node)
 {
-    return isHTMLSpanElement(node) && toElement(node)->getAttribute(classAttr) == AppleTabSpanClass;
+    if (!isHTMLSpanElement(node) || toElement(node)->getAttribute(classAttr) != AppleTabSpanClass)
+        return false;
+    UseCounter::count(node->document(), UseCounter::EditingAppleTabSpanClass);
+    return true;
 }
 
 bool isTabSpanTextNode(const Node* node)

third_party/WebKit/Source/core/frame/UseCounter.h

@@ -455,6 +455,11 @@ public:
         HTMLImports = 455,
         ElementCreateShadowRoot = 456,
         DocumentRegisterElement = 457,
+        EditingAppleInterchangeNewline = 458,
+        EditingAppleConvertedSpace = 459,
+        EditingApplePasteAsQuotation = 460,
+        EditingAppleStyleSpanClass = 461,
+        EditingAppleTabSpanClass = 462,
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         // Also, run update_use_counter_feature_enum.py in chromium/src/tools/metrics/histograms/