gpu: Add CHROMIUM_texture_from_image spec and fence support.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 008dcdbbcb388d4db7fd76b743c818aec0c374c2..cac9cf86f81a156ead3e4cbcadcbe2b88b9b78e8 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1036,12 +1036,8 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
                                          const volatile GLbyte* key);
   void DoApplyScreenSpaceAntialiasingCHROMIUM();
 
-  void DoBindTexImage2DCHROMIUM(
-      GLenum target,
-      GLint image_id);
-  void DoReleaseTexImage2DCHROMIUM(
-      GLenum target,
-      GLint image_id);
+  void DoBindTexImage2DCHROMIUM(GLenum target, GLint image_id, GLint fence_id);
+  void DoReleaseTexImage2DCHROMIUM(GLenum target, GLint image_id);
 
   void DoTraceEndCHROMIUM(void);
 
@@ -2701,7 +2697,7 @@ bool BackTexture::AllocateNativeGpuMemoryBuffer(const gfx::Size& size,
   scoped_refptr<gl::GLImage> image =
       decoder_->GetContextGroup()->image_factory()->CreateAnonymousImage(
           size, buffer_format, format);
-  if (!image || !image->BindTexImage(Target()))
+  if (!image || !image->BindTexImage(Target(), nullptr))
     return false;
 
   image_ = image;
@@ -16418,8 +16414,9 @@ void GLES2DecoderImpl::DoPushGroupMarkerEXT(
 void GLES2DecoderImpl::DoPopGroupMarkerEXT(void) {
 }
 
-void GLES2DecoderImpl::DoBindTexImage2DCHROMIUM(
-    GLenum target, GLint image_id) {
+void GLES2DecoderImpl::DoBindTexImage2DCHROMIUM(GLenum target,
+                                                GLint image_id,
+                                                GLint fence_id) {
   TRACE_EVENT0("gpu", "GLES2DecoderImpl::DoBindTexImage2DCHROMIUM");
 
   if (target == GL_TEXTURE_CUBE_MAP) {
@@ -16448,6 +16445,16 @@ void GLES2DecoderImpl::DoBindTexImage2DCHROMIUM(
     return;
   }
 
+  gl::GLFence* fence = nullptr;
+  if (fence_id) {
+    fence = fence_manager()->LookupFence(fence_id);
+    if (!fence) {
+      LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, "glBindTexImage2DCHROMIUM",
+                         "no fence found with the given ID");
+      return;
+    }
+  }
+
   Texture::ImageState image_state = Texture::UNBOUND;
 
   {
@@ -16456,10 +16463,13 @@ void GLES2DecoderImpl::DoBindTexImage2DCHROMIUM(
 
     // Note: We fallback to using CopyTexImage() before the texture is used
     // when BindTexImage() fails.
-    if (image->BindTexImage(target))
+    if (image->BindTexImage(target, fence))
       image_state = Texture::BOUND;
   }
 
+  DLOG_IF(WARNING, fence && image_state != Texture::BOUND)
+      << "BindTexImage2D fence ignored by CopyTexImage() fallback";
+
   gfx::Size size = image->GetSize();
   GLenum internalformat = image->GetInternalFormat();
   texture_manager()->SetLevelInfo(
@@ -16468,8 +16478,8 @@ void GLES2DecoderImpl::DoBindTexImage2DCHROMIUM(
   texture_manager()->SetLevelImage(texture_ref, target, 0, image, image_state);
 }
 
-void GLES2DecoderImpl::DoReleaseTexImage2DCHROMIUM(
-    GLenum target, GLint image_id) {
+void GLES2DecoderImpl::DoReleaseTexImage2DCHROMIUM(GLenum target,
+                                                   GLint image_id) {
   TRACE_EVENT0("gpu", "GLES2DecoderImpl::DoReleaseTexImage2DCHROMIUM");
 
   // Default target might be conceptually valid, but disallow it to avoid