Add SetImageData api to chrome.clipboard.

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 5ddbde70f6bb7e88071e2e6b119ebeed6427e785..c1c3630fd640cbcf8a4249d2f5d313df8dc1e716 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -14,6 +14,7 @@
 #include "content/public/browser/bluetooth_chooser.h"
 #include "extensions/browser/extension_event_histogram_value.h"
 #include "extensions/browser/extension_prefs_observer.h"
+#include "extensions/common/api/clipboard.h"
 #include "extensions/common/view_type.h"
 
 class ExtensionFunctionRegistry;
@@ -44,6 +45,8 @@ class UpdateClient;
 
 namespace extensions {
 
+namespace clipboard = api::clipboard;
+
 class ComponentExtensionResourceManager;
 class Extension;
 class ExtensionCache;
@@ -223,6 +226,13 @@ class ExtensionsBrowserClient {
   // is left up to the embedder.
   virtual bool IsMinBrowserVersionSupported(const std::string& min_version) = 0;
 
+  // Saves image data on clipboard.
+  virtual void SaveImageDataToClipboard(

[Devlin, 2016/11/16 02:34:33]

Why does this need to be a method on ExtensionsBrowserClient?  Why can't the API
use the helper directly and own it?

[dcheng, 2016/11/17 01:13:32]

The problem is ImageDecoder is a content API, so //extensions can't use it.

(I guess the alternative is to move the clipboard API into chrome/*/extensions?)

[Devlin, 2016/11/17 01:25:33]

//extensions already depends on //content

[jennyz, 2016/12/07 01:21:48]

But the ImageDecoder we use is under chrome/browser, not in content.

+      const std::vector<char>& image_data,
+      clipboard::ImageType type,
+      const base::Closure& success_callback,
+      const base::Closure& error_callback) = 0;
+
   // Embedders can override this function to handle extension errors.
   virtual void ReportError(content::BrowserContext* context,
                            std::unique_ptr<ExtensionError> error);