Remember which packages use atom APIs at main module load time

Signed-off-by: Nathan Sobo <nathan@github.com>

src/deserializer-manager.coffee

@@ -39,6 +39,9 @@ class DeserializerManager
       delete @deserializers[deserializer.name] for deserializer in deserializers
       return
 
+  getDeserializerCount: ->
+    Object.keys(@deserializers).length
+
   # Public: Deserialize the state and params.
   #
   # * `state` The state {Object} to deserialize.

src/package.coffee

@@ -98,7 +98,8 @@ class Package
       @metadata.deserializers? or
       @metadata.viewProviders? or
       @metadata.configSchema? or
-      @activationShouldBeDeferred()
+      @activationShouldBeDeferred() or
+      localStorage.getItem(@getCanDeferMainModuleRequireStorageKey()) is 'true'
     )
 
   reset: ->
@@ -426,7 +427,13 @@ class Package
     mainModulePath = @getMainModulePath()
     if fs.isFileSync(mainModulePath)
       @mainModuleRequired = true
+
+      previousViewProviderCount = @viewRegistry.getViewProviderCount()
+      previousDeserializerCount = @deserializerManager.getDeserializerCount()
       @mainModule = require(mainModulePath)
+      if (@viewRegistry.getViewProviderCount() is previousViewProviderCount and
+          @deserializerManager.getDeserializerCount() is previousDeserializerCount)
+        localStorage.setItem(@getCanDeferMainModuleRequireStorageKey(), 'true')
 
   getMainModulePath: ->
     return @mainModulePath if @resolvedMainModulePath
@@ -620,6 +627,9 @@ class Package
     electronVersion = process.versions['electron'] ? process.versions['atom-shell']
     "installed-packages:#{@name}:#{@metadata.version}:electron-#{electronVersion}:incompatible-native-modules"
 
+  getCanDeferMainModuleRequireStorageKey: ->
+    "installed-packages:#{@name}:#{@metadata.version}:can-defer-main-module-require"
+
   # Get the incompatible native modules that this package depends on.
   # This recurses through all dependencies and requires all modules that
   # contain a `.node` file.

src/view-registry.coffee

@@ -106,6 +106,9 @@ class ViewRegistry
     new Disposable =>
       @providers = @providers.filter (p) -> p isnt provider
 
+  getViewProviderCount: ->
+    @providers.length
+
   # Essential: Get the view associated with an object in the workspace.
   #
   # If you're just *using* the workspace, you shouldn't need to access the view