Blobs: Mechanism for creating Blobs in browser process, then transferring to renderer.

content/browser/fileapi/chrome_blob_storage_context.cc

Index: content/browser/fileapi/chrome_blob_storage_context.cc
diff --git a/content/browser/fileapi/chrome_blob_storage_context.cc b/content/browser/fileapi/chrome_blob_storage_context.cc
index 97151a83f67426d6483882bb675f13a9deab6e32..ae7a6ada929e9f028532006c5ea63380af5a12a1 100644
--- a/content/browser/fileapi/chrome_blob_storage_context.cc
+++ b/content/browser/fileapi/chrome_blob_storage_context.cc
@@ -5,8 +5,10 @@
 #include "content/browser/fileapi/chrome_blob_storage_context.h"
 
 #include "base/bind.h"
+#include "base/guid.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
+#include "webkit/browser/blob/blob_data_handle.h"
 #include "webkit/browser/blob/blob_storage_context.h"
 
 using base::UserDataAdapter;
@@ -14,6 +16,22 @@ using webkit_blob::BlobStorageContext;
 
 namespace content {
 
+class ChromeBlobHandle : public BlobHandle {

[michaeln, 2014/05/08 23:03:18]

The ChromeXXX naming convention is really archaic and doesn't fit at all
anymore. Lets call this BlobHandleImpl or something like that. wdyt?

Also this class should be in an annon namespace.

[tommycli, 2014/05/09 16:10:17]

Done.

+ public:
+  ChromeBlobHandle(scoped_ptr<webkit_blob::BlobDataHandle> handle)
+      : handle_(handle.Pass()) {
+  }
+
+  virtual ~ChromeBlobHandle() {}
+
+  virtual std::string uuid() OVERRIDE {
+    return handle_->uuid();
+  }
+
+ private:
+  scoped_ptr<webkit_blob::BlobDataHandle> handle_;
+};
+
 static const char* kBlobStorageContextKeyName = "content_blob_storage_context";
 
 ChromeBlobStorageContext::ChromeBlobStorageContext() {}
@@ -43,8 +61,32 @@ void ChromeBlobStorageContext::InitializeOnIOThread() {
   context_.reset(new BlobStorageContext());
 }
 
+void ChromeBlobStorageContext::CreateMemoryBackedBlob(
+    const char* data, size_t length, const BlobCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTaskAndReplyWithResult(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&ChromeBlobStorageContext::CreateMemoryBackedBlobOnIOThread,
+                 this, data, length, callback),
+      callback);
+}
+
 ChromeBlobStorageContext::~ChromeBlobStorageContext() {}
 
+scoped_ptr<BlobHandle>
+ChromeBlobStorageContext::CreateMemoryBackedBlobOnIOThread(
+    const char* data, size_t length, const BlobCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  std::string uuid(base::GenerateGUID());
+  scoped_refptr<webkit_blob::BlobData> blob_data =
+      new webkit_blob::BlobData(uuid);
+  blob_data->AppendData(data, length);
+  scoped_ptr<BlobHandle> blob_handle(
+      new ChromeBlobHandle(context_->AddFinishedBlob(blob_data.get()).Pass()));
+  return blob_handle.Pass();
+}
+
 void ChromeBlobStorageContext::DeleteOnCorrectThread() const {
   if (BrowserThread::IsMessageLoopValid(BrowserThread::IO) &&
       !BrowserThread::CurrentlyOn(BrowserThread::IO)) {