Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_page/cpdf_imageobject.cpp

Index: core/fpdfapi/fpdf_page/cpdf_imageobject.cpp
diff --git a/core/fpdfapi/fpdf_page/cpdf_imageobject.cpp b/core/fpdfapi/fpdf_page/cpdf_imageobject.cpp
index 6203d562738133fbe06b882a955a7403ab146219..e2defa80544be13b50a30babfe498ed7edae4a4e 100644
--- a/core/fpdfapi/fpdf_page/cpdf_imageobject.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_imageobject.cpp
@@ -33,11 +33,27 @@ CPDF_ImageObject* CPDF_ImageObject::Clone() const {
   return obj;
 }
 
+CPDF_PageObject::Type CPDF_ImageObject::GetType() const {
+  return IMAGE;
+}
+
 void CPDF_ImageObject::Transform(const CFX_Matrix& matrix) {
   m_Matrix.Concat(matrix);
   CalcBoundingBox();
 }
 
+bool CPDF_ImageObject::IsImage() const {
+  return true;
+}
+
+CPDF_ImageObject* CPDF_ImageObject::AsImage() {
+  return this;
+}
+
+const CPDF_ImageObject* CPDF_ImageObject::AsImage() const {
+  return this;
+}
+
 void CPDF_ImageObject::CalcBoundingBox() {
   m_Left = m_Bottom = 0;
   m_Right = m_Top = 1.0f;