[jumbo] make IsValidCoordinate functions into static members

This should avoid the following jumbo build error:

./../../third_party/WebKit/Source/core/css/cssom/CSSScale.cpp:14:6: error: redefinition of 'IsValidCoordinate'
bool IsValidCoordinate(CSSNumericValue* value) {
     ^
./../../third_party/WebKit/Source/core/css/cssom/CSSPositionValue.cpp:15:6: note: previous definition is here
bool IsValidCoordinate(CSSNumericValue* v) {
     ^

BUG=789370

Change-Id: I13f1540c9969d4ff34420fcfda831687c4580555
Reviewed-on: https://chromium-review.googlesource.com/822199Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#523732}

third_party/WebKit/Source/core/css/cssom/CSSPositionValue.cpp

@@ -10,15 +10,6 @@
 
 namespace blink {
 
-namespace {
-
-bool IsValidCoordinate(CSSNumericValue* v) {
-  return v->Type().MatchesBaseTypePercentage(
-      CSSNumericValueType::BaseType::kLength);
-}
-
-}  // namespace
-
 CSSPositionValue* CSSPositionValue::Create(CSSNumericValue* x,
                                            CSSNumericValue* y,
                                            ExceptionState& exception_state) {
@@ -62,4 +53,10 @@ const CSSValue* CSSPositionValue::ToCSSValue(
                               CSSValuePair::kKeepIdenticalValues);
 }
 
+// static
+bool CSSPositionValue::IsValidCoordinate(CSSNumericValue* coord) {
+  return coord->Type().MatchesBaseTypePercentage(
+      CSSNumericValueType::BaseType::kLength);
+}
+
 }  // namespace blink

third_party/WebKit/Source/core/css/cssom/CSSPositionValue.h

@@ -41,6 +41,9 @@ class CORE_EXPORT CSSPositionValue final : public CSSStyleValue {
     CSSStyleValue::Trace(visitor);
   }
 
+ private:
+  static bool IsValidCoordinate(CSSNumericValue* coord);
+
  protected:
   CSSPositionValue(CSSNumericValue* x, CSSNumericValue* y) : x_(x), y_(y) {}
 

third_party/WebKit/Source/core/css/cssom/CSSScale.cpp

@@ -11,10 +11,6 @@ namespace blink {
 
 namespace {
 
-bool IsValidCoordinate(CSSNumericValue* value) {
-  return value && value->Type().MatchesNumber();
-}
-
 CSSScale* FromScale(const CSSFunctionValue& value) {
   DCHECK(value.length() == 1U || value.length() == 2U);
   CSSNumericValue* x =
@@ -179,4 +175,9 @@ CSSScale::CSSScale(CSSNumericValue* x,
   DCHECK(IsValidCoordinate(z));
 }
 
+// static
+bool CSSScale::IsValidCoordinate(CSSNumericValue* coord) {
+  return coord && coord->Type().MatchesNumber();
+}
+
 }  // namespace blink

third_party/WebKit/Source/core/css/cssom/CSSScale.h

@@ -71,6 +71,9 @@ class CORE_EXPORT CSSScale final : public CSSTransformComponent {
   Member<CSSNumericValue> x_;
   Member<CSSNumericValue> y_;
   Member<CSSNumericValue> z_;
+
+  static bool IsValidCoordinate(CSSNumericValue* coord);
+
   DISALLOW_COPY_AND_ASSIGN(CSSScale);
 };