PPAPI: Make generator support "no_interface_string"

This is so I can introduce a new way to do PPP interfaces that are
passed to a related PPB interface, instead of using PPP_GetInterface.

Note this doesn't add support for the PNaCl shim yet, although it should
at least make it compile.

BUG=367896

Review URL: https://codereview.chromium.org/281203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271425 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/generators/idl_c_header.py

@@ -288,6 +288,9 @@ class HGen(GeneratorByFile):
       # Skip this interface if there are no matching versions
       if not unique: continue
 
+      # Skip this interface if it should have no interface string.
+      if node.GetProperty('no_interface_string'): continue
+
       last_stable_ver = None
       last_dev_rel = None
       for rel in unique:

ppapi/generators/idl_gen_wrapper.py

@@ -349,7 +349,9 @@ const void *__%(wrapper_prefix)s_PPPGetInterface(const char *name) {
 
   def GenerateWrapperInfoAndCollection(self, iface_releases, out):
     for iface in iface_releases:
-      iface_macro = self.cgen.GetInterfaceMacro(iface.node, iface.version)
+      iface_macro = "NULL"
+      if not iface.node.GetProperty("no_interface_string"):
+        iface_macro = self.cgen.GetInterfaceMacro(iface.node, iface.version)
       if iface.needs_wrapping:
         wrap_iface = '(const void *) &%s_Wrappers_%s' % (self.wrapper_prefix,
                                                          iface.struct_name)

ppapi/generators/test_cgen/interface.h

@@ -66,6 +66,12 @@ struct ifaceBar_1_0 {
 };
 
 typedef struct ifaceBar_1_0 ifaceBar;
+
+struct ifaceNoString_1_0 {
+  void (*mem)(void);
+};
+
+typedef struct ifaceNoString_1_0 ifaceNoString;
 /**
  * @}
  */

ppapi/generators/test_cgen/interface.idl

@@ -41,6 +41,11 @@ interface ifaceBar {
   ifaceFoo createIface([in] str_t name);
 };
 
+[no_interface_string]
+interface ifaceNoString {
+  void mem();
+};
+
 struct struct2 {
   ifaceBar bar;
 };