Separate BufferedDataSource and BufferedResourceLoader into two files.

net/http/http_util.h

Index: net/http/http_util.h
diff --git a/net/http/http_util.h b/net/http/http_util.h
index 2f5bd85a667ba54a0ae66ee738a0cfc941f240a3..a9082d645878f6eca967177352f9bfb7871f05ed 100644
--- a/net/http/http_util.h
+++ b/net/http/http_util.h
@@ -26,6 +26,45 @@ class HttpRequestHeaders;
 class HttpStream;
 class UploadDataStream;
 
+const char kHttpScheme[] = "http";
+const char kHttpsScheme[] = "https";
+const char kDataScheme[] = "data";
+const int64 kPositionNotSpecified = -1;
+const int kHttpOK = 200;
+const int kHttpPartialContent = 206;
+
+// Define the number of bytes in a megabyte.
+const size_t kMegabyte = 1024 * 1024;
+
+// Backward capacity of the buffer, by default 2MB.
+const size_t kBackwardCapcity = 2 * kMegabyte;
+
+// Forward capacity of the buffer, by default 10MB.
+const size_t kForwardCapacity = 10 * kMegabyte;
+
+// The threshold of bytes that we should wait until the data arrives in the
+// future instead of restarting a new connection. This number is defined in the
+// number of bytes, we should determine this value from typical connection speed
+// and amount of time for a suitable wait. Now I just make a guess for this
+// number to be 2MB.
+// TODO(hclam): determine a better value for this.
+const int kForwardWaitThreshold = 2 * kMegabyte;
+
+// Defines how long we should wait for more data before we declare a connection
+// timeout and start a new request.
+// TODO(hclam): We should really remove this (crbug.com/64571).
+const int kTimeoutMilliseconds = 5000;
+
+// Defines how many times we should try to read from a buffered resource loader
+// before we declare a read error. After each failure of read from a buffered
+// resource loader, a new one is created to be read.
+const int kReadTrials = 3;
+
+// BufferedDataSource has an intermediate buffer, this value governs the initial
+// size of that buffer. It is set to 32KB because this is a typical read size
+// of FFmpeg.
+const int kInitialReadBufferSize = 32768;
+
 class HttpUtil {
  public:
   // Returns the absolute path of the URL, to be used for the http request.
@@ -177,6 +216,15 @@ class HttpUtil {
                                   bool enable_full_url,
                                   HttpRequestHeaders* request_headers);
 
+  // Returns true if |url| operates on HTTP protocol.
+  static bool IsHttpProtocol(const GURL& url) {
+    return url.SchemeIs(kHttpScheme) || url.SchemeIs(kHttpsScheme);
+  }
+
+  static bool IsDataProtocol(const GURL& url) {
+    return url.SchemeIs(kDataScheme);
+  }
+
   // Used to iterate over the name/value pairs of HTTP headers.  To iterate
   // over the values in a multi-value header, use ValuesIterator.
   // See AssembleRawHeaders for joining line continuations (this iterator