linux: scan more plugin directories, fix bugs

We now scan more directories, sort file entries by mtime, use
realpath() before loading plugins (fixes a Java bug), and de-duplicate
multiple instances of the same plugin.
This matches the Mozilla plugin loading code more closely.

We also ignore xpcom-related errors while loading plugins, as that
breaks layout tests.

I encountered this while attempting to fix QuickTime (need to load
the Totem plugins) but the fix overlaps with the Java one.  I believe
neither quite work yet, though.

BUG=16787,19712
TEST=about:plugins should show more plugins

Review URL: http://codereview.chromium.org/173550

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@24691 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 2 deletions

diff --git a/base/native_library_linux.cc b/base/native_library_linux.cc
index 05050bd..2e5db88 100644
--- a/base/native_library_linux.cc
+++ b/base/native_library_linux.cc
@@ -16,8 +16,14 @@ namespace base {
 NativeLibrary LoadNativeLibrary(const FilePath& library_path) {
   void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
   if (!dl) {
-    LOG(ERROR) << "dlopen failed when trying to open " << library_path.value()
-               << ": " << dlerror();
+    std::string error_message = dlerror();
+    // Some obsolete plugins depend on libxul or libxpcom.
+    // Ignore the error messages when failing to load these.
+    if (error_message.find("libxul.so") == std::string::npos &&
+        error_message.find("libxpcom.so") == std::string::npos) {
+      LOG(ERROR) << "dlopen failed when trying to open " << library_path.value()
+                 << ": " << error_message;
+    }
   }
 
   return dl;