Handle null cache directory

data/android directory doesn't exist sometimes, and hence cache
directory creation fails. Don't crash the process due to that.

Change-Id: I22d7ed5df9c70f021a87029e89a13a11b4b0303b

Author: Amith Yamasani

core/java/android/app/ActivityThread.java

@@ -4070,10 +4070,14 @@ private void handleBindApplication(AppBindData data) {
         if (!Process.isIsolated()) {
             final File cacheDir = appContext.getCacheDir();
 
-            // Provide a usable directory for temporary files
-            System.setProperty("java.io.tmpdir", cacheDir.getAbsolutePath());
-
-            setupGraphicsSupport(data.info, cacheDir);
+            if (cacheDir != null) {
+                // Provide a usable directory for temporary files
+                System.setProperty("java.io.tmpdir", cacheDir.getAbsolutePath());
+    
+                setupGraphicsSupport(data.info, cacheDir);
+            } else {
+                Log.e(TAG, "Unable to setupGraphicsSupport due to missing cache directory");
+            }
         }
         /**
          * For system applications on userdebug/eng builds, log stack

core/java/android/app/ContextImpl.java

@@ -769,7 +769,7 @@ public File getCacheDir() {
             }
             if (!mCacheDir.exists()) {
                 if(!mCacheDir.mkdirs()) {
-                    Log.w(TAG, "Unable to create cache directory");
+                    Log.w(TAG, "Unable to create cache directory " + mCacheDir.getAbsolutePath());
                     return null;
                 }
                 FileUtils.setPermissions(