Centralize TextStream functions to remove RenderTreeAsText dependency of the filters

Source/platform/text/TextStream.h

Index: Source/platform/text/TextStream.h
diff --git a/Source/platform/text/TextStream.h b/Source/platform/text/TextStream.h
index d7ecf1c2ed8d0dfcb7baac8cd599de475e4e54ae..9e0c12c43b332d1ae03538546e345d6c162fdf69 100644
--- a/Source/platform/text/TextStream.h
+++ b/Source/platform/text/TextStream.h
@@ -28,11 +28,19 @@
 
 #include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
+#include "wtf/Vector.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/unicode/Unicode.h"
 
 namespace WebCore {
 
+class IntPoint;
+class IntRect;
+class LayoutPoint;
+class FloatPoint;
+class FloatRect;
+class FloatSize;
+
 class PLATFORM_EXPORT TextStream {
 public:
     struct FormatNumberRespectingIntegers {
@@ -60,6 +68,30 @@ private:
     StringBuilder m_text;
 };
 
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const IntPoint&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const IntRect&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatPoint&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatSize&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatRect&);
+
+PLATFORM_EXPORT void writeIndent(TextStream&, int indent);
+
+template<typename Item>
+TextStream& operator<<(TextStream& ts, const Vector<Item>& vector)
+{
+    ts << "[";
+
+    unsigned size = vector.size();
+    for (unsigned i = 0; i < size; ++i) {
+        ts << vector[i];
+        if (i < size - 1)
+            ts << ", ";
+    }
+
+    ts << "]";
+    return ts;
+}
+
 }
 
 #endif