Add missing STDCALL annotations

This CL adds the missing STDCALL annotations from the PDFium APIs.

Bug: pdfium:818
Change-Id: I415efbb68f6f90cc367a4fc7289619764b528ade
Reviewed-on: https://pdfium-review.googlesource.com/8031
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>
diff --git a/fpdfsdk/fpdfeditpath.cpp b/fpdfsdk/fpdfeditpath.cpp
index 12d8a97..2181df8 100644
--- a/fpdfsdk/fpdfeditpath.cpp
+++ b/fpdfsdk/fpdfeditpath.cpp
@@ -43,11 +43,11 @@
   return pPathObj.release();  // Caller takes ownership.
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_SetStrokeColor(FPDF_PAGEOBJECT path,
-                                            unsigned int R,
-                                            unsigned int G,
-                                            unsigned int B,
-                                            unsigned int A) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_SetStrokeColor(FPDF_PAGEOBJECT path,
+                                                    unsigned int R,
+                                                    unsigned int G,
+                                                    unsigned int B,
+                                                    unsigned int A) {
   if (!path || R > 255 || G > 255 || B > 255 || A > 255)
     return false;
 
@@ -60,11 +60,11 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_GetStrokeColor(FPDF_PAGEOBJECT path,
-                                            unsigned int* R,
-                                            unsigned int* G,
-                                            unsigned int* B,
-                                            unsigned int* A) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_GetStrokeColor(FPDF_PAGEOBJECT path,
+                                                    unsigned int* R,
+                                                    unsigned int* G,
+                                                    unsigned int* B,
+                                                    unsigned int* A) {
   if (!path || !R || !G || !B || !A)
     return false;
 
@@ -78,7 +78,8 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_SetStrokeWidth(FPDF_PAGEOBJECT path, float width) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_SetStrokeWidth(FPDF_PAGEOBJECT path,
+                                                    float width) {
   if (!path || width < 0.0f)
     return false;
 
@@ -88,19 +89,19 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_SetFillColor(FPDF_PAGEOBJECT path,
-                                          unsigned int R,
-                                          unsigned int G,
-                                          unsigned int B,
-                                          unsigned int A) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_SetFillColor(FPDF_PAGEOBJECT path,
+                                                  unsigned int R,
+                                                  unsigned int G,
+                                                  unsigned int B,
+                                                  unsigned int A) {
   return FPDFPageObj_SetFillColor(path, R, G, B, A);
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_GetFillColor(FPDF_PAGEOBJECT path,
-                                          unsigned int* R,
-                                          unsigned int* G,
-                                          unsigned int* B,
-                                          unsigned int* A) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_GetFillColor(FPDF_PAGEOBJECT path,
+                                                  unsigned int* R,
+                                                  unsigned int* G,
+                                                  unsigned int* B,
+                                                  unsigned int* A) {
   if (!path || !R || !G || !B || !A)
     return false;
 
@@ -114,7 +115,9 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_MoveTo(FPDF_PAGEOBJECT path, float x, float y) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_MoveTo(FPDF_PAGEOBJECT path,
+                                            float x,
+                                            float y) {
   if (!path)
     return false;
 
@@ -124,7 +127,9 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_LineTo(FPDF_PAGEOBJECT path, float x, float y) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_LineTo(FPDF_PAGEOBJECT path,
+                                            float x,
+                                            float y) {
   if (!path)
     return false;
 
@@ -134,13 +139,13 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_BezierTo(FPDF_PAGEOBJECT path,
-                                      float x1,
-                                      float y1,
-                                      float x2,
-                                      float y2,
-                                      float x3,
-                                      float y3) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_BezierTo(FPDF_PAGEOBJECT path,
+                                              float x1,
+                                              float y1,
+                                              float x2,
+                                              float y2,
+                                              float x3,
+                                              float y3) {
   if (!path)
     return false;
 
@@ -152,7 +157,7 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_Close(FPDF_PAGEOBJECT path) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_Close(FPDF_PAGEOBJECT path) {
   if (!path)
     return false;
 
@@ -165,9 +170,9 @@
   return true;
 }
 
-DLLEXPORT FPDF_BOOL FPDFPath_SetDrawMode(FPDF_PAGEOBJECT path,
-                                         int fillmode,
-                                         FPDF_BOOL stroke) {
+DLLEXPORT FPDF_BOOL STDCALL FPDFPath_SetDrawMode(FPDF_PAGEOBJECT path,
+                                                 int fillmode,
+                                                 FPDF_BOOL stroke) {
   if (!path)
     return false;