Decompress ETC texture data when there is no native support.

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 6ce5b3c72a8bf8985211f66deedf14f81cb94b98..f666771bafe8473edc2006c537fd5b7c0bac87e2 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -2324,6 +2324,8 @@ _PEPPER_INTERFACES = [
 # decoder_func: defines which function to call in the decoder to execute the
 #               corresponding GL command. If not specified the GL command will
 #               be called directly.
+# check_decoder_func_result: Signals that the decoder_func returns an error
+#               that should be checked. Defaults to False.
 # gl_test_func: GL function that is expected to be called when testing.
 # cmd_args:     The arguments to use for the command. This overrides generating
 #               them based on the GL function arguments.
@@ -2602,12 +2604,14 @@ _FUNCTION_INFO = {
     'type': 'Data',
     'data_transfer_methods': ['bucket', 'shm'],
     'decoder_func': 'DoCompressedTexImage2D',
+    'check_decoder_func_result': True,
     'trace_level': 1,
   },
   'CompressedTexSubImage2D': {
     'type': 'Data',
     'data_transfer_methods': ['bucket', 'shm'],
     'decoder_func': 'DoCompressedTexSubImage2D',
+    'check_decoder_func_result': True,
     'trace_level': 1,
   },
   'CopyTexImage2D': {
@@ -2625,6 +2629,7 @@ _FUNCTION_INFO = {
     'type': 'Data',
     'data_transfer_methods': ['bucket', 'shm'],
     'decoder_func': 'DoCompressedTexImage3D',
+    'check_decoder_func_result': True,
     'unsafe': True,
     'trace_level': 1,
   },
@@ -2632,6 +2637,7 @@ _FUNCTION_INFO = {
     'type': 'Data',
     'data_transfer_methods': ['bucket', 'shm'],
     'decoder_func': 'DoCompressedTexSubImage3D',
+    'check_decoder_func_result': True,
     'unsafe': True,
     'trace_level': 1,
   },
@@ -4953,17 +4959,25 @@ static_assert(offsetof(%(cmd_name)s::Result, %(field_name)s) == %(offset)d,
       f.write("  group_->Get%sServiceId(%s, &%s);\n" %
                  (id_type, id_type.lower(), id_type.lower()))
 
+  def WriteGLFunctionCallCode(self, func, f):
+    """Writes the call to the GL function."""
+    if func.ShouldCheckGLFunctionResult():
+      f.write("    error::Error error = ")
+    f.write("  %s(%s);\n" %
+               (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+    if func.ShouldCheckGLFunctionResult():
+      f.write("    if (error != error::kNoError)")
+      f.write("      return error;")
+
   def WriteImmediateHandlerImplementation (self, func, f):
     """Writes the handler impl for the immediate version of a command."""
     self.__WriteIdMapping(func, f)
-    f.write("  %s(%s);\n" %
-               (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+    self.WriteGLFunctionCallCode(func, f)
 
   def WriteBucketHandlerImplementation (self, func, f):
     """Writes the handler impl for the bucket version of a command."""
     self.__WriteIdMapping(func, f)
-    f.write("  %s(%s);\n" %
-               (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+    self.WriteGLFunctionCallCode(func, f)
 
   def WriteServiceHandlerFunctionHeader(self, func, f):
     """Writes function header for service implementation handlers."""
@@ -5527,8 +5541,7 @@ class StateSetHandler(TypeHandler):
         if item.get('cached', False):
           f.write("    state_.%s = %s;\n" %
                      (CachedStateName(item), args[ndx].name))
-      f.write("    %s(%s);\n" %
-                 (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+      self.WriteGLFunctionCallCode(func, f)
     f.write("  }\n")
 
   def WriteServiceUnitTest(self, func, f, *extras):
@@ -5612,8 +5625,7 @@ class StateSetRGBAlphaHandler(TypeHandler):
     if 'state_flag' in state:
       f.write("    %s = true;\n" % state['state_flag'])
     if not func.GetInfo("no_gl"):
-      f.write("    %s(%s);\n" %
-                 (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+      self.WriteGLFunctionCallCode(func, f)
       f.write("  }\n")
 
 
@@ -5648,8 +5660,7 @@ class StateSetFrontBackSeparateHandler(TypeHandler):
     if 'state_flag' in state:
       f.write("    %s = true;\n" % state['state_flag'])
     if not func.GetInfo("no_gl"):
-      f.write("    %s(%s);\n" %
-                 (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+      self.WriteGLFunctionCallCode(func, f)
     f.write("  }\n")
 
 
@@ -5674,8 +5685,7 @@ class StateSetFrontBackHandler(TypeHandler):
     if 'state_flag' in state:
       f.write("    %s = true;\n" % state['state_flag'])
     if not func.GetInfo("no_gl"):
-      f.write("    %s(%s);\n" %
-                 (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+      self.WriteGLFunctionCallCode(func, f)
     f.write("  }\n")
 
 
@@ -9663,6 +9673,9 @@ class Function(object):
       return self.GetInfo('decoder_func')
     return "gl%s" % self.original_name
 
+  def ShouldCheckGLFunctionResult(self):
+    return self.GetInfo('check_decoder_func_result', False)
+
   def GetGLTestFunctionName(self):
     gl_func_name = self.GetInfo('gl_test_func')
     if gl_func_name == None: