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 348c336ccc867c6c2cc8f7b7523249ddcd72029f..4319c3fd8cff6a16bf397e5a3c20e2ed2babeb03 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -13,6 +13,7 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ -315,6 +316,12 @@ bool WebApkInstaller::StartUpdateUsingDownloadedWebApk(
       env, java_ref_, java_file_path);
 }
 
+bool WebApkInstaller::HasGooglePlayWebApkInstallDelegate() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  return Java_WebApkInstaller_hasGooglePlayWebApkInstallDelegate(
+      env, java_ref_);
+}
+
 void WebApkInstaller::OnURLFetchComplete(const net::URLFetcher* source) {
   timer_.Stop();
 
@@ -339,6 +346,17 @@ void WebApkInstaller::OnURLFetchComplete(const net::URLFetcher* source) {
     OnFailure();
     return;
   }
+
+  if (HasGooglePlayWebApkInstallDelegate()) {
+    int version = 1;
+    base::StringToInt(response->version(), &version);
+    if (!InstallOrUpdateWebApkFromGooglePlay(
+        response->package_name(), version, response->token())) {
+      OnFailure();
+    }
+    return;
+  }
+
   OnGotWebApkDownloadUrl(signed_download_url, response->package_name());
 }
 
@@ -410,6 +428,29 @@ void WebApkInstaller::SendRequest(std::unique_ptr<webapk::WebApk> request_proto,
   url_fetcher_->Start();
 }
 
+bool WebApkInstaller::InstallOrUpdateWebApkFromGooglePlay(

[pkotwicz, 2016/12/06 16:46:32]

Nit: Reorder this function to match order in .h file

[Xi Han, 2016/12/06 20:30:38]

Done.

+    const std::string& package_name,
+    int version,
+    const std::string& 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_token =
+      base::android::ConvertUTF8ToJavaString(env, token);
+
+  if (task_type_ == WebApkInstaller::INSTALL) {
+    return Java_WebApkInstaller_installWebApkFromGooglePlayAsync(
+        env, java_ref_, java_webapk_package, version, java_title, java_token);
+  } else {
+    return Java_WebApkInstaller_updateAsyncFromGooglePlay(
+        env, java_ref_, java_webapk_package, version, java_title, java_token);
+  }
+}
+
 void WebApkInstaller::OnGotWebApkDownloadUrl(const GURL& download_url,
                                              const std::string& package_name) {
   webapk_package_ = package_name;