Download WebAPK into a WebAPK-specifc directory, and delete all cached ones.

chrome/browser/android/webapk/webapk_installer.h

Index: chrome/browser/android/webapk/webapk_installer.h
diff --git a/chrome/browser/android/webapk/webapk_installer.h b/chrome/browser/android/webapk/webapk_installer.h
index eb24f5b2ce428e14f5fb30f19b64f6a1de3fc09b..544760b380cf6258c901509ad46c75d547d22319 100644
--- a/chrome/browser/android/webapk/webapk_installer.h
+++ b/chrome/browser/android/webapk/webapk_installer.h
@@ -38,6 +38,12 @@ class WebApkIconHasher;
 // Java WebApkInstaller counterpart.
 class WebApkInstaller : public net::URLFetcherDelegate {
  public:
+  enum TaskType {
+    UNDEFINED,
+    INSTALL,
+    UPDATE,
+  };
+
   // Called when the creation/updating of a WebAPK is finished or failed.
   // Parameters:
   // - whether the process succeeds.
@@ -109,12 +115,6 @@ class WebApkInstaller : public net::URLFetcherDelegate {
   void OnSuccess();
 
  private:
-  enum TaskType {
-    UNDEFINED,
-    INSTALL,
-    UPDATE,
-  };
-
   // Create the Java object.
   void CreateJavaRef();
 
@@ -149,6 +149,11 @@ class WebApkInstaller : public net::URLFetcherDelegate {
   void OnGotWebApkDownloadUrl(const GURL& download_url,
                               const std::string& package_name);
 
+  // Called once the sub directory to store the downloaded WebApk was
+  // created with permissions set properly or failed to create.
+  void OnCreateSubDirAndSetPermissions(const GURL& download_url,
+                                       const base::FilePath& file_path);
+
   // Called once the WebAPK has been downloaded. Makes the downloaded WebAPK
   // world readable and installs the WebAPK if the download was successful.
   // |file_path| is the file path that the WebAPK was downloaded to.