[SVG2] Add support for the 'turn' unit in <angle>.

Source/core/svg/SVGAngleTearOff.cpp

Index: Source/core/svg/SVGAngleTearOff.cpp
diff --git a/Source/core/svg/SVGAngleTearOff.cpp b/Source/core/svg/SVGAngleTearOff.cpp
index 8a5f832ace8e6ee456c1aa82d5aebe6f3d21c665..b7556242bd8b1a891cde1bf70ae4814b6c0d2549 100644
--- a/Source/core/svg/SVGAngleTearOff.cpp
+++ b/Source/core/svg/SVGAngleTearOff.cpp
@@ -32,6 +32,7 @@
 #include "core/svg/SVGAngleTearOff.h"
 
 #include "bindings/v8/ExceptionState.h"
+#include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/ExceptionCode.h"
 
 namespace WebCore {
@@ -108,7 +109,16 @@ void SVGAngleTearOff::setValueAsString(const String& value, ExceptionState& exce
         return;
     }
 
+    String old = target()->valueAsString();

[fs, 2014/06/11 07:29:07]

Nit: s/old/oldValue/ (or something)

[Erik Dahlström (inactive), 2014/06/11 08:04:25]

Done.

+
     target()->setValueAsString(value, exceptionState);
+
+    if (!exceptionState.hadException() && !hasExposedAngleUnit()) {
+        target()->setValueAsString(old, IGNORE_EXCEPTION); // rollback to old value

[fs, 2014/06/11 07:29:07]

Nit: ASSERT_NO_EXCEPTION might be even better?

[Erik Dahlström (inactive), 2014/06/11 08:04:25]

Done.

+        exceptionState.throwDOMException(SyntaxError, "The value provided ('" + value + "') is invalid.");
+        return;
+    }
+
     commitChange();
 }