Chrome talks to Play to install WebAPKs.

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index 3e09705476b1da17ff780250ded602ab8e8ab6dd..c771a039110668c5e5a65507d300a198cdfcab41 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/android/webapk/webapk_installer.h"
 
+#include <stdlib.h>
+
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ -18,11 +20,13 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
 #include "base/threading/sequenced_worker_pool.h"
+#include "chrome/browser/android/chrome_feature_list.h"
 #include "chrome/browser/android/shortcut_helper.h"
 #include "chrome/browser/android/webapk/webapk.pb.h"
 #include "chrome/browser/android/webapk/webapk_icon_hasher.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
+#include "components/variations/variations_associated_data.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/manifest_util.h"
@@ -38,6 +42,9 @@ namespace {
 const char kDefaultServerUrl[] =
     "https://test-webapk.sandbox.googleapis.com/v1/webApks/?alt=proto&key=AIzaSyAoI6v-F31-3t9NunLYEiKcPIqgTJIUZBw";
 
+// Flag of whether installing WebAPKs from Play Store is enabled.
+const char kPlayInstallWebApks[] = "play_install_webapks";
+
 // The MIME type of the POST data sent to the server.
 const char kProtoMimeType[] = "application/x-protobuf";
 
@@ -53,6 +60,13 @@ const int kWorldReadableFilePermission = base::FILE_PERMISSION_READ_BY_USER |
                                          base::FILE_PERMISSION_READ_BY_GROUP |
                                          base::FILE_PERMISSION_READ_BY_OTHERS;
 
+// Returns whether the |play_install_webapks| param of the currently active
+// field trials is true.
+bool IsPlayInstallWebApksEnabled() {
+  return variations::GetVariationParamValueByFeature(chrome::android::kWebApks,
+      kPlayInstallWebApks) == "true";
+}
+
 // Returns the WebAPK server URL based on the command line.
 GURL GetServerUrl() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
@@ -339,6 +353,16 @@ void WebApkInstaller::OnURLFetchComplete(const net::URLFetcher* source) {
     OnFailure();
     return;
   }
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  if (IsPlayInstallWebApksEnabled() &&
+      Java_WebApkInstaller_hasWebApkInstallClientDelegate(env, java_ref_)) {
+    InstallWebApkFromPlayStore(response->package_name(),
+                               std::atoi(response->version().c_str()),
+                               response->wam_token());
+    return;
+  }
+
   OnGotWebApkDownloadUrl(signed_download_url, response->package_name());
 }
 
@@ -410,6 +434,24 @@ void WebApkInstaller::SendRequest(std::unique_ptr<webapk::WebApk> request_proto,
   url_fetcher_->Start();
 }
 
+void WebApkInstaller::InstallWebApkFromPlayStore(

[pkotwicz, 2016/12/01 04:18:04]

We should probably rename this method to InstallOrUpdateWebApkFromPlayStore()

unless update is not yet implemented

[Xi Han, 2016/12/01 22:22:28]

Good catch! The update part is added.

+    const std::string& package_name,
+    int version,
+    const std::string& wam_token) {
+  webapk_package_ = package_name;
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jstring> java_webapk_package =
+      base::android::ConvertUTF8ToJavaString(env, webapk_package_);
+  base::android::ScopedJavaLocalRef<jstring> java_title =
+      base::android::ConvertUTF16ToJavaString(env, shortcut_info_.user_title);
+  base::android::ScopedJavaLocalRef<jstring> java_wam_token =
+      base::android::ConvertUTF8ToJavaString(env, wam_token);
+
+  Java_WebApkInstaller_installWebApkFromPlayStoreAsyncAndMonitorInstallation(
+      env, java_ref_, java_webapk_package, version, java_title, java_wam_token);
+}
+
 void WebApkInstaller::OnGotWebApkDownloadUrl(const GURL& download_url,
                                              const std::string& package_name) {
   webapk_package_ = package_name;