Decouple browser-specific GPU IPC messages from GPU service IPCs

We would like Mus to reuse GPU service IPC messages. However,
browser-specific<=>gpu messages don't necessarily
make sense in Mus+Ash. This CL decouples browser messages
from Gpu channel messages in the following ways:

1. Browser channel messages are moved to a gpu_host_messages.h file.

2. Browser channel message handling is moved entirely to GpuChildThread.

3. GpuChannelManager is decoupled from GpuChildThread by making
GpuChildThread a GpuChannelManagerDelegate.

The intent here is for Mus to implement an alternative
GpuChannelManagerDelegate.

BUG=586374

Review URL: https://codereview.chromium.org/1711533002

Cr-Commit-Position: refs/heads/master@{#377341}

1 files changed, 3 insertions, 3 deletions

diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 7ce05a0..958e40d 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -21,8 +21,8 @@
 #include "content/child/child_process.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/gpu/gpu_config.h"
+#include "content/common/gpu/gpu_host_messages.h"
 #include "content/common/gpu/gpu_memory_buffer_factory.h"
-#include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/media/gpu_jpeg_decode_accelerator.h"
 #include "content/common/gpu/media/gpu_video_decode_accelerator.h"
 #include "content/common/gpu/media/gpu_video_encode_accelerator.h"
@@ -121,8 +121,8 @@ bool GpuProcessLogMessageHandler(int severity,
                                  const std::string& str) {
   std::string header = str.substr(0, message_start);
   std::string message = str.substr(message_start);
-  deferred_messages.Get().push(new GpuHostMsg_OnLogMessage(
-      severity, header, message));
+  deferred_messages.Get().push(
+      new GpuHostMsg_OnLogMessage(severity, header, message));
   return false;
 }