Add base::android::GetPathToBaseApk()

Bug: crashpad:30
Change-Id: I433eba2e734244dd80d9becae84789fd406de25d
Reviewed-on: https://chromium-review.googlesource.com/1202703Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593045}

base/android/java/src/org/chromium/base/PathUtils.java

@@ -261,4 +261,13 @@ public abstract class PathUtils {
     public static String getExternalStorageDirectory() {
         return Environment.getExternalStorageDirectory().getAbsolutePath();
     }
+
+    /**
+     * @ return the path to the base apk.
+     */
+    @SuppressWarnings("unused")
+    @CalledByNative
+    public static String getPathToBaseApk() {
+      return ContextUtils.getApplicationContext().getApplicationInfo().sourceDir;
+    }
 }

base/android/path_utils.cc

@@ -78,5 +78,14 @@ bool GetExternalStorageDirectory(FilePath* result) {
   return true;
 }
 
+bool GetPathToBaseApk(FilePath* result) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jstring> path =
+      Java_PathUtils_getPathToBaseApk(env);
+  FilePath apk_path(ConvertJavaStringToUTF8(path));
+  *result = apk_path;
+  return true;
+}
+
 }  // namespace android
 }  // namespace base

base/android/path_utils.h

@@ -49,6 +49,10 @@ BASE_EXPORT bool GetNativeLibraryDirectory(FilePath* result);
 // is placed in the FilePath pointed to by 'result'.
 BASE_EXPORT bool GetExternalStorageDirectory(FilePath* result);
 
+// Retrieves the absolute path the base APK. The result is placed in the
+// FilePath pointed to by 'result'.
+BASE_EXPORT bool GetPathToBaseApk(FilePath* result);
+
 }  // namespace android
 }  // namespace base