[GeometryInterface] Add setMatrixValue(transfromList) function.

third_party/WebKit/Source/core/dom/DOMMatrix.cpp

Index: third_party/WebKit/Source/core/dom/DOMMatrix.cpp
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
index 89f117301bd3dc3aafabe0953cf3c968049dcc9a..4da0cd4ee612c29eb3f4932ef68072d287628a3b 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
@@ -4,6 +4,12 @@
 
 #include "core/dom/DOMMatrix.h"
 
+#include "core/css/CSSToLengthConversionData.h"
+#include "core/css/parser/CSSParser.h"
+#include "core/css/resolver/TransformBuilder.h"
+#include "core/layout/api/LayoutViewItem.h"
+#include "core/style/ComputedStyle.h"
+
 namespace blink {
 
 DOMMatrix* DOMMatrix::create(ExceptionState& exceptionState)
@@ -207,4 +213,45 @@ DOMMatrix* DOMMatrix::invertSelf()
     return this;
 }
 
+static inline PassRefPtr<ComputedStyle> createInitialStyle()
+{
+    RefPtr<ComputedStyle> initialStyle = ComputedStyle::create();
+    initialStyle->font().update(nullptr);
+    return initialStyle;
+}
+
+DOMMatrix* DOMMatrix::setMatrixValue(const String& string, ExceptionState& exceptionState)
+{
+    String inputString;
+    if (string.isEmpty()) {
+        inputString = "matrix(1, 0, 0, 1, 0, 0)";
+    } else {
+        inputString = string;
+    }
+
+    if (const CSSValue* value = CSSParser::parseSingleValue(CSSPropertyTransform, inputString)) {
+        if (value->isPrimitiveValue() && (toCSSPrimitiveValue(value))->getValueID() == CSSValueNone)
+            exceptionState.throwDOMException(SyntaxError, "Failed to parse '" + string + "'.");
+
+        DEFINE_STATIC_REF(ComputedStyle, initialStyle, createInitialStyle());
+        TransformOperations operations;
+        TransformBuilder::createTransformOperations(*value, CSSToLengthConversionData(initialStyle, initialStyle, LayoutViewItem(nullptr), 1.0f), operations);
+
+        // Convert transform operations to a TransformationMatrix. This can fail
+        // if a param has a percentage ('%')
+        if (operations.dependsOnBoxSize())
+            exceptionState.throwDOMException(SyntaxError, "The transformation depends on the box size, which is not supported.");
+
+        if (operations.has3DOperation())
+            m_is2D = false;
+
+        operations.apply(FloatSize(0, 0), *m_matrix);
+
+    } else { // There is something there but parsing failed.
+        exceptionState.throwDOMException(SyntaxError, "Failed to parse '" + string + "'.");
+    }
+
+    return this;
+}
+
 } // namespace blink