clang-format all pdfium code.

public/fpdf_ppo.h

Index: public/fpdf_ppo.h
diff --git a/public/fpdf_ppo.h b/public/fpdf_ppo.h
index 2e033f14d3733d593efebe7a51af57ae2ba5b896..e7d77678f95e9bdf910caa7e06cdbfd40d3ff52e 100644
--- a/public/fpdf_ppo.h
+++ b/public/fpdf_ppo.h
@@ -19,21 +19,26 @@ extern "C" {
 //          dest_doc    -   The destination document which add the pages.
 //          src_doc     -   A document to be imported.
 //          pagerange   -   A page range string, Such as "1,3,5-7".
-//                          If this parameter is NULL, it would import all pages in src_doc.
+//                          If this parameter is NULL, it would import all pages
+//                          in src_doc.
 //          index       -   The page index wanted to insert from.
 // Return value:
 //          TRUE for succeed, FALSE for Failed.
-DLLEXPORT FPDF_BOOL STDCALL FPDF_ImportPages(FPDF_DOCUMENT dest_doc,FPDF_DOCUMENT src_doc, FPDF_BYTESTRING pagerange, int index);
-
+DLLEXPORT FPDF_BOOL STDCALL FPDF_ImportPages(FPDF_DOCUMENT dest_doc,
+                                             FPDF_DOCUMENT src_doc,
+                                             FPDF_BYTESTRING pagerange,
+                                             int index);
 
 // Function: FPDF_CopyViewerPreferences
 //          Copy the viewer preferences from one PDF document to another.#endif
 // Parameters:
-//          dest_doc    -   Handle to document to write the viewer preferences to.
+//          dest_doc    -   Handle to document to write the viewer preferences
+//          to.
 //          src_doc     -   Handle to document with the viewer preferences.
 // Return value:
 //          TRUE for success, FALSE for failure.
-DLLEXPORT FPDF_BOOL STDCALL FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc, FPDF_DOCUMENT src_doc);
+DLLEXPORT FPDF_BOOL STDCALL FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc,
+                                                       FPDF_DOCUMENT src_doc);
 
 #ifdef __cplusplus
 }