This patch adds some Android-support code to allow the network

stack to use platform-specific private key objects to perform
signing in the context of SSL handshakes which require a client
certificate.

More specifically:

- Add net/android/keystore.h, which provides native
  functions to operate on JNI references pointing to
  java.security.PrivateKey objects provided by the
  platform. I.e.:

    net::android::GetPrivateKeyType()
    net::android::SignWithPrivateKey()

  Also provide a function that can get the system's own
  EVP_PKEY* handle corresponding to a given PrivateKey
  object. This uses reflection and should *only* be used
  for RSA private keys when running on Android 4.0 and
  4.1, in order to route around a platform bug that was
  only fixed in 4.2.

    net::android::GetOpenSSLSytstemHandleForPrivateKey()

  See the comments in this source file for mode details:

    net/android/java/org/chromium/net/AndroidKeyStore.java

- Add net/android/keystore_openssl.h, which provides
  a function that can wrap an existing PrivateKey
  JNI reference around an OpenSSL EVP_PKEY object
  which uses custom DSA/RSA/ECDSA methods to perform
  signing as expected to handle client certificates.

   net::android::GetOpenSSLPrivateKeyWrapper()

- Add relevant unit tests for the new functions.
  Note that the unit test comes with its own Java helper
  function, which is used to create a platform PrivateKey
  object from encoded PKCS#8 private key data.

  This is called from the native unit test, but does not
  constitute a new Java test (AndroidKeyStoreTestUtil.java).

- Add corresponding new test key files under
  net/data/ssl/certificates/, and their generation
  script in net/data/ssl/scripts/.

- Add net/android/private_key_type_list.h which is
  used both from C++ and Java to define the list of
  supported private key types used by this code.

- Minor improvements: Add a "release()" method to
  crypto::ScopedOpenSSL, add missing BASE_EXPORT
  to one base/android/jni_array.h function declaration.

BUG=166642


Review URL: https://chromiumcodereview.appspot.com/11571059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181741 0039d316-1c4b-4281-b951-d872f2087c98

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