Improve publishing to Bintray

- Update bintray-release version
- Publish to exoplayer-test unless -PpublicRepo=true
- Publish GVR extension
- Minimize duplication with new publish.gradle

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=150185740

build.gradle

@@ -17,7 +17,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.0'
-        classpath 'com.novoda:bintray-release:0.3.4'
+        classpath 'com.novoda:bintray-release:0.4.0'
     }
 }
 
@@ -34,10 +34,16 @@ allprojects {
         compileSdkVersion=25
         targetSdkVersion=25
         buildToolsVersion='25'
-        releaseRepoName = 'exoplayer'
+        releaseRepoName = getBintrayRepo()
         releaseUserOrg = 'google'
         releaseGroupId = 'com.google.android.exoplayer'
         releaseVersion = 'r2.2.0'
         releaseWebsite = 'https://github.com/google/ExoPlayer'
     }
 }
+
+def getBintrayRepo() {
+    boolean publicRepo = hasProperty('publicRepo') &&
+        property('publicRepo').toBoolean()
+    return publicRepo ? 'exoplayer' : 'exoplayer-test'
+}

extensions/gvr/build.gradle

@@ -27,3 +27,9 @@ dependencies {
     compile project(':library')
     compile 'com.google.vr:sdk-audio:1.30.0'
 }
+
+ext {
+    releaseArtifact = 'extension-gvr'
+    releaseDescription = 'Google VR extension for ExoPlayer.'
+}
+apply from: '../../publish.gradle'

extensions/okhttp/build.gradle

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 apply plugin: 'com.android.library'
-apply plugin: 'bintray-release'
 
 android {
     compileSdkVersion project.ext.compileSdkVersion
@@ -36,12 +35,8 @@ dependencies {
     }
 }
 
-publish {
-    artifactId = 'extension-okhttp'
-    description = 'An OkHttp extension for ExoPlayer.'
-    repoName = releaseRepoName
-    userOrg = releaseUserOrg
-    groupId = releaseGroupId
-    version = releaseVersion
-    website = releaseWebsite
+ext {
+    releaseArtifact = 'extension-okhttp'
+    releaseDescription = 'OkHttp extension for ExoPlayer.'
 }
+apply from: '../../publish.gradle'

library/build.gradle

@@ -14,7 +14,6 @@
 import com.android.builder.core.BuilderConstants
 
 apply plugin: 'com.android.library'
-apply plugin: 'bintray-release'
 
 android {
     compileSdkVersion project.ext.compileSdkVersion
@@ -81,12 +80,8 @@ android.libraryVariants.all { variant ->
     }
 }
 
-publish {
-    artifactId = 'exoplayer'
-    description = 'The ExoPlayer library.'
-    repoName = releaseRepoName
-    userOrg = releaseUserOrg
-    groupId = releaseGroupId
-    version = releaseVersion
-    website = releaseWebsite
+ext {
+    releaseArtifact = 'exoplayer'
+    releaseDescription = 'The ExoPlayer library.'
 }
+apply from: '../publish.gradle'

publish.gradle

@@ -0,0 +1,24 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+apply plugin: 'bintray-release'
+
+publish {
+    artifactId = releaseArtifact
+    description = releaseDescription
+    repoName = releaseRepoName
+    userOrg = releaseUserOrg
+    groupId = releaseGroupId
+    version = releaseVersion
+    website = releaseWebsite
+}