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..fce0bed906621b099fcd5aa647f9c4dd3a6b294a 100644
--- a/content/browser/fileapi/chrome_blob_storage_context.cc
+++ b/content/browser/fileapi/chrome_blob_storage_context.cc
@@ -5,8 +5,11 @@
 #include "content/browser/fileapi/chrome_blob_storage_context.h"
 
 #include "base/bind.h"
+#include "base/guid.h"
+#include "content/public/browser/blob_handle.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 +17,26 @@ using webkit_blob::BlobStorageContext;
 
 namespace content {
 
+namespace {
+
+class BlobHandleImpl : public BlobHandle {
+ public:
+  BlobHandleImpl(scoped_ptr<webkit_blob::BlobDataHandle> handle)
+      : handle_(handle.Pass()) {
+  }
+
+  virtual ~BlobHandleImpl() {}
+
+  virtual std::string GetUUID() OVERRIDE {
+    return handle_->uuid();
+  }
+
+ private:
+  scoped_ptr<webkit_blob::BlobDataHandle> handle_;
+};
+
+}  // namespace
+
 static const char* kBlobStorageContextKeyName = "content_blob_storage_context";
 
 ChromeBlobStorageContext::ChromeBlobStorageContext() {}
@@ -43,6 +66,25 @@ void ChromeBlobStorageContext::InitializeOnIOThread() {
   context_.reset(new BlobStorageContext());
 }
 
+scoped_ptr<BlobHandle> ChromeBlobStorageContext::CreateMemoryBackedBlob(
+    const char* data, size_t length) {
+  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<webkit_blob::BlobDataHandle> blob_data_handle =
+      context_->AddFinishedBlob(blob_data.get());
+  if (!blob_data_handle)
+    return scoped_ptr<BlobHandle>();
+
+  scoped_ptr<BlobHandle> blob_handle(
+      new BlobHandleImpl(blob_data_handle.Pass()));
+  return blob_handle.Pass();
+}
+
 ChromeBlobStorageContext::~ChromeBlobStorageContext() {}
 
 void ChromeBlobStorageContext::DeleteOnCorrectThread() const {