Make code compile with clang_use_chrome_plugin (part V)chromium/2770

This change mainly contains files in xfa/fxfa directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2071683002

1 files changed, 15 insertions, 0 deletions

diff --git a/xfa/fxfa/app/xfa_fwltheme.cpp b/xfa/fxfa/app/xfa_fwltheme.cpp
index e2e1b29c08..0706988de8 100644
--- a/xfa/fxfa/app/xfa_fwltheme.cpp
+++ b/xfa/fxfa/app/xfa_fwltheme.cpp
@@ -120,6 +120,16 @@ uint32_t CXFA_FWLTheme::SetThemeID(IFWL_Widget* pWidget,
   return 0;
 }
 
+FWL_Error CXFA_FWLTheme::GetThemeMatrix(IFWL_Widget* pWidget,
+                                        CFX_Matrix& matrix) {
+  return FWL_Error::Succeeded;
+}
+
+FWL_Error CXFA_FWLTheme::SetThemeMatrix(IFWL_Widget* pWidget,
+                                        const CFX_Matrix& matrix) {
+  return FWL_Error::Succeeded;
+}
+
 FX_BOOL CXFA_FWLTheme::DrawBackground(CFWL_ThemeBackground* pParams) {
   return GetTheme(pParams->m_pWidget)->DrawBackground(pParams);
 }
@@ -345,6 +355,11 @@ void* CXFA_FWLTheme::GetCapacity(CFWL_ThemePart* pThemePart,
 FX_BOOL CXFA_FWLTheme::IsCustomizedLayout(IFWL_Widget* pWidget) {
   return GetTheme(pWidget)->IsCustomizedLayout(pWidget);
 }
+
+FWL_Error CXFA_FWLTheme::GetPartRect(CFWL_ThemePart* pThemePart,
+                                     CFX_RectF& rtPart) {
+  return FWL_Error::Succeeded;
+}
 FWL_Error CXFA_FWLTheme::GetPartRect(CFWL_ThemePart* pThemePart) {
   CFX_RectF rect;
   return GetTheme(pThemePart->m_pWidget)->GetPartRect(pThemePart, rect);