doxygen: Include all API versions and generated files (see #3836)

Doxyfile

@@ -184,7 +184,13 @@ FULL_PATH_NAMES        = YES
 # will be relative from the directory where doxygen is started.
 # This tag requires that the tag FULL_PATH_NAMES is set to YES.
 
-STRIP_FROM_PATH        =
+# CEF NOTE: Intentionally keeping the 'gen' prefix for these includes in the
+# "File List" side panel to differentiate directories.
+# See https://github.com/doxygen/doxygen/issues/8318.
+
+STRIP_FROM_PATH        = . \
+                         ../out/Release_GN_x64 \
+                         ../out/Release_GN_arm64
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the
 # path mentioned in the documentation of a class, which tells the reader which
@@ -909,7 +915,9 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = README.md \
-                         include
+                         include \
+                         ../out/Release_GN_x64/gen/cef/include \
+                         ../out/Release_GN_arm64/gen/cef/include
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -2329,15 +2337,15 @@ ENABLE_PREPROCESSING   = YES
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-MACRO_EXPANSION        = NO
+MACRO_EXPANSION        = YES
 
 # If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then
 # the macro expansion is limited to the macros specified with the PREDEFINED and
 # EXPAND_AS_DEFINED tags.
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-EXPAND_ONLY_PREDEF     = NO
+EXPAND_ONLY_PREDEF     = YES
 
 # If the SEARCH_INCLUDES tag is set to YES, the include files in the
 # INCLUDE_PATH will be searched if a #include is found.
@@ -2376,7 +2384,12 @@ PREDEFINED             = USING_CEF_SHARED \
                          OS_LINUX \
                          CEF_X11 \
                          OS_MAC \
-                         ARCH_CPU_32_BITS
+                         __OBJC__ \
+                         OS_POSIX \
+                         ARCH_CPU_32_BITS \
+                         CEF_API_ADDED(v)=1 \
+                         CEF_API_REMOVED(v)=1 \
+                         CEF_API_RANGE(a,r)=1
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The