[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 966810654a5eed9950886b24b46a341f051a327b..de14957fd2e6b3909b7afadc109e2fbde2207782 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
@@ -4,6 +4,14 @@
 
 #include "core/dom/DOMMatrix.h"
 
+#include "core/css/CSSIdentifierValue.h"
+#include "core/css/CSSToLengthConversionData.h"
+#include "core/css/CSSValueList.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) {
@@ -245,4 +253,53 @@ DOMMatrix* DOMMatrix::invertSelf() {
   return this;
 }
 
+DOMMatrix* DOMMatrix::setMatrixValue(const String& inputString,
+                                     ExceptionState& exceptionState) {
+  DEFINE_STATIC_LOCAL(String, identityMatrix2D, ("matrix(1, 0, 0, 1, 0, 0)"));
+  String string = inputString;
+  if (string.isEmpty())
+    string = identityMatrix2D;
+
+  const CSSValue* value =
+      CSSParser::parseSingleValue(CSSPropertyTransform, string);
+
+  if (!value || value->isCSSWideKeyword()) {
+    exceptionState.throwDOMException(SyntaxError,
+                                     "Failed to parse '" + inputString + "'.");
+    return nullptr;
+  }
+
+  if (value->isIdentifierValue()) {
+    DCHECK(toCSSIdentifierValue(value)->getValueID() == CSSValueNone);
+    m_matrix->makeIdentity();
+    m_is2D = true;
+    return this;
+  }
+
+  if (TransformBuilder::hasRelativeLengths(toCSSValueList(*value))) {
+    exceptionState.throwDOMException(SyntaxError,
+                                     "Relative lengths not supported.");
+    return nullptr;
+  }
+
+  const ComputedStyle& initialStyle = ComputedStyle::initialStyle();
+  TransformOperations operations = TransformBuilder::createTransformOperations(
+      *value, CSSToLengthConversionData(&initialStyle, &initialStyle,
+                                        LayoutViewItem(nullptr), 1.0f));
+
+  if (operations.dependsOnBoxSize()) {
+    exceptionState.throwDOMException(SyntaxError,
+                                     "The transformation depends on the box "
+                                     "size, which is not supported.");
+    return nullptr;
+  }
+
+  m_matrix->makeIdentity();
+  operations.apply(FloatSize(0, 0), *m_matrix);
+
+  m_is2D = !operations.has3DOperation();
+
+  return this;
+}
+
 }  // namespace blink