Enable forced extension updates on NaCl arch mismatch

This makes extensions aware of the platforms for which
they have platform-specific resources installed, if any.

This also hooks up the extension update code with some
additional logic to place an extension in forced-update
mode if it has platform-specific resources which don't
match the current NaCl architecture.

BUG=409948
TEST=install an extension which uses NaCl (QuickOffice for example). Rename the _platform-specific/<your-nacl-arch> directory some something else and force an update (e.g. via chrome://extensions button). Observe that a new CRX is downloaded and installed.

Review URL: https://codereview.chromium.org/516293007

Cr-Commit-Position: refs/heads/master@{#293018}

1 files changed, 7 insertions, 0 deletions

diff --git a/extensions/common/extension.h b/extensions/common/extension.h
index 668f52f..9312c62 100644
--- a/extensions/common/extension.h
+++ b/extensions/common/extension.h
@@ -351,6 +351,9 @@ class Extension : public base::RefCountedThreadSafe<Extension> {
   void AddWebExtentPattern(const URLPattern& pattern);
   const URLPatternSet& web_extent() const { return extent_; }
 
+  bool HasPlatformSpecificResources() const;
+  bool HasResourcesForPlatform(const std::string& arch) const;
+
  private:
   friend class base::RefCountedThreadSafe<Extension>;
 
@@ -480,6 +483,10 @@ class Extension : public base::RefCountedThreadSafe<Extension> {
   // The flags that were passed to InitFromValue.
   int creation_flags_;
 
+  // The set of archs for which platform-specific resources are present in
+  // this extension installation.
+  std::set<std::string> platform_specific_resource_archs_;
+
   DISALLOW_COPY_AND_ASSIGN(Extension);
 };