Provide stdout and stderr output in the Observatory debugger.

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index 59f8300a266fb602b639043a82ebd4f2e0ed2980..d5b201320bde4dc31b6e6da90aae111d2cf38b8e 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -10,12 +10,22 @@
 #include "bin/utils.h"
 
 #include "include/dart_api.h"
+#include "include/dart_tools_api.h"
 
 namespace dart {
 namespace bin {
 
 static const int kMSPerSecond = 1000;
 
+// Are we capturing output from either stdout or stderr for the VM Service?
+bool captureStdio = false;

[Cutch, 2015/07/13 14:10:29]

capture_stdio

[turnidge, 2015/07/13 22:50:36]

Done.

+
+// Are we capturing output from stdout for the VM service?
+bool captureStdout = false;

[Cutch, 2015/07/13 14:10:29]

capture_stdout

...

[turnidge, 2015/07/13 22:50:36]

Done.

+
+// Are we capturing output from stderr for the VM service?
+bool captureStderr = false;
+
 
 // The file pointer has been passed into Dart as an intptr_t and it is safe
 // to pull it out of Dart as a 64-bit integer, cast it to an intptr_t and
@@ -52,6 +62,18 @@ bool File::WriteFully(const void* buffer, int64_t num_bytes) {
     remaining -= bytes_written;  // Reduce the number of remaining bytes.
     current_buffer += bytes_written;  // Move the buffer forward.
   }
+  if (captureStdio) {
+    intptr_t fd = GetFD();
+    if (fd == 1 && captureStdout) {

[Cutch, 2015/07/13 14:10:29]

(fd == STDOUT_FILENO) && 

[turnidge, 2015/07/13 22:50:36]

Done.  Also fixed existing usage of 0, 1, 2 in File_OpenStdio and
File_GetStdioHandleType.

+      Dart_ServiceSendDataEvent("Stdout", "WriteEvent",
+                                reinterpret_cast<const uint8_t*>(buffer),
+                                num_bytes);
+    } else if (fd == 2 && captureStderr) {

[Cutch, 2015/07/13 14:10:29]

(fd == STDERR_FILENO) &&

[turnidge, 2015/07/13 22:50:36]

Done.

+      Dart_ServiceSendDataEvent("Stderr", "WriteEvent",
+                                reinterpret_cast<const uint8_t*>(buffer),
+                                num_bytes);
+    }
+  }
   return true;
 }